So what voltage is the alternator designed to work at ? If not 15. My '99 silverado has what seems to have high voltage output from the alternator. If the voltage is not that high, look to the engine mounts as being so hardened that vibration is killing the headlights. Common for a dirty connection to allow voltage thru to measure but not allow needed amperage thru. Then turn the engine off and measure the battery voltage again. If alternator output voltage gets too high the regulator shorts the field to ground to reduce the magnetic strength right now. ALTERNATOR NOISY: Alternator mountings loose. Well, in theory, it is very simple. Even a stock alternator is capable of massive voltage output, but is regulated to around 14V through the voltage regulator. Are You Smarter Than a 'Smart' Charging System? By Dave Hobbs No matter how complex 'smart' charging systems appear at first glance, it still comes down to a battery, an alternator and some modules monitoring and controlling voltage regulation. That is the acid solution about to make its presence known. Maybe it had a failing bearing, or an open or shorted diode in the internal rectifier. This was one of my mistakes. Is this too high? The Haynes manual doesn't give a voltage. Yes, if you fit a higher capacity alternator you will need to upgrade the wiring, both positive as well as return and introduce an appropriate cable protect fuse. The internally regulated alternators (used on the 78 and beyond) use a sense wire to control the alternator output. I read on a tech sight that below 13. If the small wire is not reading a voltage close to the other two (say within. my alternator ( i assume alternator) regulator must have went out and i noticed the volt gauge was way over 15 volts,, off the scale,, when i turned on headlights it went down to 15 volts, still too high but read on the gauge, i ran the truck for a day like this and when i went to start it in the morning it wouldnt start,, after some diagnosis, ie. 5ish range for volts. Defective alternator diodes can be detected by using alternator test equipment that measures the amount of alternating voltage (commonly known as “ripple”) in the charging circuit. A new regulator might do the trick as well, the alternator only does what the regulator tells him, if the regulator is faulty or getting a poor (low) voltage signal he will command the alternator to go for max output while it is not required. The alternator (via internal voltage regulator) will set the alternator output voltage so that the "voltage sensing input" is at e. Re: Let's figure out alternator wiring, once and for all! HELP! ok to explain the warning lamp, when the engine is running the regulator rapidly switches the field current on and off, when it's on it's 12 volts+ when off it's ground. If you let it sit a lot or take short drives it can't charge efficiently. compensate for voltage drops along the alternator cables. This way the battery as well the automobile don’t get damaged from high voltage. 2 volts at high currents. You should be in the 13-14. Unplug one component at time and note the battery voltage. Too high belt tension increases bearing fatigue, resulting in bearing failure. Frequent episodes of mild overheating can result in the same amount of component damage as a few episodes of severe overheating. The meter should now read 13. It reported P1594 Charging System Voltage Too High. Voltage = Pressure – Voltage is pretty much the “pressure” of the electrons and indicates how sharply and quickly they move through the cables. IF the engine is COLD it may show slightly higher than 14. The reason for that was that the alternator was charging the battery at 18. 5VDC with the engine running – just don’t leave it connected too long (check the gel cell terminal voltage). If the charging voltage is too low in the alternator, the charging system could fail, causing the car to break down. Do the same for the alternator's. Small case alternators are not designed for continuous high-output operation. the voltage regulator should operate instantaneously to limit the charge to no more than 14. 5 volts/cell), so the fact you saw 15-17 volts on your volt meter tells me your meter is off, or more likely, the alternator regulator is a bit happy. Connect carbon pile tester across batteries. It is a new alternator. 5 volts when hot to 14 volts when cold. batteries are 6 months old. 5vdc when I first start it up on a cold morning. Once you turn on the engine and the alternator kicks in, the battery voltage will rise near 14V. This is often manifested in short battery life, frequent jump-starts or perceived alternator and starter problems. too high value of the charge current after 4-6 hours of continuous driving; light bulbs often burn out in the car lighting system. If the alternator voltage output is high you'll get: An unpleasant, sulfur smell from the car battery. Toyota vehicles. However, many factory wiring systems get around thisspec by using a main "buss-bar" for central power. If it decreases and starts to drop until vehicle eventually dies, you have a defective alternator. Under some scenarios, such as if a cell is out of balance, the pack/bank voltage will rise above the alternator voltage and exceed the BMS's HVC (High Voltage Cutoff) state. 0 volts is too low, and there is a problem, either the voltage regulator, or the alternator. It is equally important that the system is neither under- or over-charging. Even with headlights on, it should be 13. A while back the alternator light started flickering in my 78 LTD, and began to do it increasingly. Problem is when it is running at full throttle the ammeter is pegged to charging and the voltages I am seeing at the battery are constantly changing high voltages, 18v plus. compensate for voltage drops along the alternator cables. We have 16V alternators for use with high voltage systems commonly used in racing applications. 2 but today it was 14. Voltage regulator I would stray more towards a diode in the alternator or a. 8 volts, then you should measure voltage at Alternator B+ and the alternator case. This connection keeps it from overchargeing. Hi, I have exactly the same problem with my wife's grand Cherokee, if your alternator and battery are good and all connections are good then it's the voltage regulator in the computer that is bad, this is what is wrong with my wife's jeep, I'm going to fit an external voltage regulator to the body of the car, I'm going to splice the cables from the ones on the rear of the alternator to the. 17 volts is just about max unregulated output on a 12 volt alternator so I would suspect that the voltage regulator is defective or somehow not working correctly. Have the alternator checked as the gage is probably telling you the truth. If this is the case, it only means that the alternator is not charging, but does not reveal why. It should measure about 12. The DC output voltage is regulated to be 14. Batteries will buffer most damage caused by out of range voltage issues. The regulator should compensate for this and keep the voltage around 6. If all you wanted to do is regulate the output voltage, a simple voltage reference, opamp, and gate driver for the IGBT is sufficient; just a bang-bang on-off field controller with no PID required. With the engine running, use a voltmeter to measure voltage at the battery. Normally the maximum charging voltage varies in 14. It's not possible for the voltage to be too high; that's what the regulator is for. If voltage is greater than or equal to 13. Setting the voltage threshold is a compromise and battery experts refer to this as “dancing on the head of a pin. How to Fix. IF the belt has been loose for an extended period of time your batteries could easily be low and need fully charged. Defective water temperature indicator or sender. When the engine is running, the alternator AC voltage is rectified through the three phase bridge. Started getting occasional battery light on 2000 MPV. 7 volts DC on a fully charged battery. The following charging methods are recommended to ensure a long battery life. Most pulleys are available in 2. This is scaring me and a new one is too expensive. As you suggest, something other than alternator is probably causing problem, plan to have Freightliner look at it and will let you know what they find. If alternator voltage drops more than. No, the volt gauge is NOT limited to the alternator. Too high Service battery charge current. More significantly, it also covers very large loads simultaneously. The alternator output voltage rises as the field current increases and it falls as the field current decreases. If cranking time is too long, check the oil and engine. One reason why alternators have a high failure rate is because they’re always working under a load. When a new alternator is installed, check the battery voltage and use a battery charger to bring the battery up to full charge before you return the vehicle to your customer. 6 and 15 volts. This way the battery as well the automobile don’t get damaged from high voltage. 6 Too low voltage at no load. If the regulator did not monitor the voltage to your battery it would destroy it. Mechman Alternators can build a high output alternator for almost any application with outputs ranging from 150a to 370a. Any ideas what is wrong here?. 7 volts DC on a fully charged battery. Is that a normal reading or too high. 16 volts instead. This current will be lagging the voltage due to inductors La and Lb, producing a lagging power factor. P0103 Trouble code definition Mass Airflow (MAF) Circuit High Air Flow and High Voltage Output The Code P0103 code is often associated with a P0100, P0101, The wiring or MAF sensor may be too. Note: While this article is specifically directed to generator-equipped VWs, much of the information herein is applicable to alternator-equipped VWs, too. So, to answer your question, Yes, 15 volts is too high. This means that the output voltage of your alternator at say 14 volts is not being presented to the batteries. The meter should now read 13. 5 volts, the voltage regulator will cut off the circuit entirely, which brings DF to zero and stops the alternator from producing any power. Screw it in and it incresses the rpm, out decrease. 5 vdc and 14. Why alternator not building up voltage Loss of residual magnetism cos it was idle for long time or it was motored before; Field excitation ckt is open or very high resistance wire broken voltmeter faulty, too many rotary diode shorted or fuse of diode blown rectifier,transformer…. The charging rate was okay apart from engine running without lights which should have been about 2. That seems a little high, so I put the meter on it and got reading of 15. There are tricks to using a diode to extend the ground voltage so that the alternator works slightly higher voltage. Re: Help pls - Alternator voltage too high, blowing LEDs? Post by MarekH » Wed Nov 14, 2018 10:16 am For people who have contributed to this thread, I'd be interested to know what voltage they measure on a running car (i. Also, when starter current draw is high, remember that battery voltage will often drop below 9. Alternator charges with too high voltage Sunday also meant boat work and it was time to move Anne-Mon from the winter location to our ship. Negative Side Reading is Too High--Most Common Causes 1) Negative battery terminal connection is corroded or loose. Alternator tested as high voltage AGAIN with no load 15. If you smell something that smells like sulfur, stop driving it. 6-15v depending on the rpm. charging too high. A new compact, high-speed alternator with a built-in IC regulator is now used on most models. then its too low. High alternator voltage trip: This is the most common trip used. I read on a tech sight that below 13. Balmar alternators and regulators. A too small pulley "V" will result in the belt riding too high in the pulley, an inability to turn the pulley properly along with shortened belt life. i5 - rt Seems like the regulator circuits within the alternator has failed - it should be 14. The battery test display on the bottom of the tester shows your 12-Volt battery’s state of charge as a percentage of output circuit voltage in 100%, 75%, 50% or 25% increments. The original pulley diameter was 3 inches. Was going to buy a new alternator, but luckily I found a barely used rebuilt alternator locally (AL0703X) from a wrecked E46. 5 charge it before testing the alternator. measure the voltage at battery with car running and lights on blower on high and anything else you can turn on. It should put out plenty of voltage that way, basically you are by-passing the regulator, but becareful not to allow it to keep putting "high" voltage in the battery. Car Battery Too high voltage? Um, while driving my car, i was watchin the voltage gauge and it goes crazy between 13 and 16 volts and after a while my speedometer hud turns off. Negative Side Reading is Too High--Most Common Causes 1) Negative battery terminal connection is corroded or loose. I did have to get a different serpentine belt as the original is too short. If the voltage is too high, it can damage or "fry" the electrical components. This is the most common trip used. The amperage rating on an alternator is basically just the amount of current that the unit is capable of putting out, not the amount it always puts out. Bypass coupled with remote voltage sensing for voltage regulator allows harness to have stable voltage levels, and over charging problems are greatly reduced. Answer: If bad voltage, too high or too low, causes damage it will normally be the battery that takes the brunt of it. One wire Alternator. It a voltage regulation issue. Run the engine at 2000 RPM. The Batt says 12. Any alternator voltage will shoot-up if the battery is disconnected while the engine is running. Is the charging system voltage too high and to be concerned of? I have the factory service manuals, so I learned the voltage regulator is in the PCM. I talked to a friend who's a tech for toyota and has built a few cars and he said 9/10 times its the restrictor? In the alternator going causing it to overcharge and its not being regulated correctly. Voltage regulators adjust output voltage according to the demands of the electrical system. In the event of the battery voltage going too high the unit will switch the regulator 'off' and display a warning. Clip the carbon pile positive clamp on the alternator positive post and the negative clamp on the alternator body. 5 Volts which is way to high!!! It should be around 14 volts +/-. Technician A says that this reading indicates the positive battery cable has too high resistance. Too high Service battery charge current. Over-charging is caused by the voltage regulator driving the alternator too hard. In hot/warm weather it typically charges at less voltage, but in frigid/cold temps it requires a higher charging voltage. The regulator is at fault if both the charging voltage and the field coil voltage are both either high or low. I would test the voltage at the battery with a meter, should be around 12 V. It covers all the energy needs on your boat and turns your alternator into a powerful energy generator. That high voltage might damage you MSD unit indeed. You have a wiring or regulator problem. When the engine is off, the battery powers the lights and accessories. Step 4: Complications. Alternator charging too high The battery started to spew water, the alternator is frying the battery. 5 volts when hot to 14 volts when cold. Start the engine, and with the engine running read the meter again. 5 volts/cell), so the fact you saw 15-17 volts on your volt meter tells me your meter is off, or more likely, the alternator regulator is a bit happy. I'm going to remove the alternator and have it bench tested, but I have a feeling the alternator is not the issue. The whine could be alternator related as evidenced by the charging voltage being too high. Essentially the voltage regulator senses that the voltage is too low and uses the battery to supply current to the rotor. Car Battery Too high voltage? Um, while driving my car, i was watchin the voltage gauge and it goes crazy between 13 and 16 volts and after a while my speedometer hud turns off. These batteries are different enough so that simply replacing an existing lead acid battery with a new sealed type battery in a vehicle equipped with a stock alternator with a built in, nonadjustable voltage regulator may require an alternator change just to protect the new battery from too high of a charging voltage!. We have 16V alternators for use with high voltage systems commonly used in racing applications. Since 1930 1-888-334-2632 www. That means that, as designed, the coil would produce too much high voltage at low rpm and heat up. It was a cheapo aftermarket regulator as is the one that came with my used truck. 8 volts, then you should measure voltage at Alternator B+ and the alternator case. With the regulator disconnected, the stator output voltage will be dependent on engine speed. 6-15v depending on the rpm. Voltage drops on the positive side of the charging circuit can cause undercharging. Charging voltage should be pretty close to 14 volts with the engine running and no headlights or other heavy loads. The warning light should illuminate when the key is turned to the ON position as a bulb check. Best Answer: All that follows assumes the voltage across the battery is actually high - above 15. I set mine to 14. 9 depending on the voltage regulator installed on your alternator. 2 volts at high currents. 9 volts at the battery and increase the alternator output to 14. The regulator is at fault if both the charging voltage and the field coil voltage are both either high or low. The Charging System Electrical Circuit Diagnosis - Course 623 5-7 Current in the charging system changes for these three different operating conditions: •Ignition switch to ON - engine stopped •Ignition switch to ON - engine running alternator output below desired voltage •Ignition switch to ON - engine running alternator output above. 4 V, the field current is cut off. Given the amount of work that was done in the engine area, and if the report of high output (15+ Volts) is accurate, it's possible a wire was broken or wasn't properly reconnected or a fuse is blown. 3-14 volts with it on. Did add a voltmeter with dial USB outlets. I would check the battery voltage after the car has been sitting with the engine off for at least 4 hours. Voltage should be less than 14. If you choose an alternator match for your wind turbine that will generate the most power available from 20km/hr winds, it will not likely even start to turn until 20-25km/hr as the load on the turbine from the alternator will be too high. 5ish range for volts. Batteries will buffer most damage caused by out of range voltage issues. If all you wanted to do is regulate the output voltage, a simple voltage reference, opamp, and gate driver for the IGBT is sufficient; just a bang-bang on-off field controller with no PID required. Low output at idle is observed as a sudden drop in voltage as the engine. Any ideas what is wrong here?. Reading Voltage Drop with the DMM. your fuse box, you can be assured that the fuse box is at 14 volts, even though there is a voltage drop between the alternator and your fuse box. 1 VDC and 14. This is strictly a test method. The alternator is basically a generator that provides an even amount of low-level electricity, which it generates with a circular bundle of copper wires and a rotating magnet. If pic C wire is cut, voltage appears to be coming from within the alternator, still oscillates, however seems to oscillate high as 8. DENSO alternators are not only original equipment on many of the world's top production cars; they are a favorite in motorsports as well, where their light weight, high efficiency, and durability under the most grueling conditions make them the natural choice. Too much vibration. A new regulator might do the trick as well, the alternator only does what the regulator tells him, if the regulator is faulty or getting a poor (low) voltage signal he will command the alternator to go for max output while it is not required. There are several signs you need to watch for that may indicate your alternator is bad. Note the changes in system voltage as you do this. Voltage should have been a maximum of 7. All units and parts are not always in stock at all locations so if your in a hurry call 616-606-5045 to check stock first. The voltage should remain high with these circuits on. Stock type Alternator and Starters We will try to ship from the location nearest you. At 75 degrees, the charge Voltage is set at 13. 6 is too high and it might have been the reason for the water level dropping so fast and the battery dieing. So this is gonna be my 3rd post about alternators. If the current is high then you need to find the cause of the current draw and repair it. with everything on, lights, heater on, blower on high, heated mirrors, c. Voltage too high?. The regulator monitors the voltage being produced on the D+ brush and if it gets too high, it short circuits the dynamo for a split second to reduce the magnet field in the stator and thus the output of generator is reduced. Normally the maximum charging voltage varies in 14. Have a helper rev up the engine from idling speed. There is a screw under the tank when your looking in from the recoil side. Wire harness and connectors. 5 volts at idle. 9v when fully charged. So it seems like the battery and alternator both drop about. At very high charge currents the voltage drop can actually be as much as 1. This newly developed regulator is designed to accurately maintain alternator output Voltage, and to compensate for outdoor temperature. Essentially the voltage regulator senses that the voltage is too low and uses the battery to supply current to the rotor. The voltage should increase with RPM until it reaches normal system voltage (as sensed by the regulator). Most vehicles utilized a Ni-Chrome resistor wire of 15. circuit boards) due to overheating. Screw it in and it incresses the rpm, out decrease. 7 volts DC on a fully charged battery. Output from each op amp will go high when the voltage from the generator exceeds the reference from the voltage divider. If the battery were way low, then much more amperage would be permitted to travel to the battery. That depends on the application [use] of the alternator. the voltage drops to the IPM. Service battery bank too deeply discharged. Back to High Amp Alternator. 4 volts the old one allowed. the system battery sensor is built into the unit and is connected to the battery out. • There is excessive drop between alternator, regulator and the battery. If voltage is quite high, maybe 18--20 or more volts, then you have an open / bad connection in the output/ charge line Now IF this test DID show good increase at battery, Next, hook up green field wire "as normal" to alternator. Not sure what battery you are using as that will have a great deal to do with the charging rate. 2 volts at high currents. Transistor burnout is the most common voltage regulator failure. 07V and loaded 14. Measured at the battery, the voltage runs between 14. P1108 FORD Dual Alternator Battery Lamp Circuit Malfunction; P1108 GMC BARO to MAP Sensor Comparison Too High; P1108 HONDA Barometric Pressure Sensor Circuit High Voltage; P1108 HYUNDAI Manifold Absolute Pressure Sensor Short Circuit ; P1108 ISUZU Barometric Pressure Circuit Input High; P1108 JAGUAR MAP Sensor Circuit Comparison Too High Voltage. Silverado & Fullsize Pick-ups - Alternator output way too high - Well ny battery is fully charged and the alternator is putting out 17 volts all the time. Slowly bring the engine RPM up while watching the VOM. 3L 1998 Felicia and the Alternator test showed that the output was High (the cheapo tester I used has 3 lights and the Red one 14. If the regulator malfunctions and allows uncontrolled voltage to be released, you will see bulbs and other electrical components begin to fail. No, the volt gauge is NOT limited to the alternator. Here is how alternators work. If the alternator you're using now burns out too fast, it's a certain sign that the alternator is underpowered for its application. This ventilation prevents the temperature of the stator windings from becoming too high. 7 when battery was still far from fully charged had me bypass this voltage regulator and add an adjustable one with potentiometer on dashboard next to voltmeters whose voltage sense lines are right on battery terminals. If the sensing voltage is low and below the alternator's setting (lights on), the system will increase current to field circuit, increasing alternator output. flowing through the rotor windings. Record voltage on voltmeter. When setting a current regulator, it's necessary to put enough load on the battery to drop the voltage well below the VR setting. As you add electrical load by turning on more accessories, the voltage will. So from a high voltage electrical protection standpoint, avalanche diodes are good, but it's a deal-killer for welding as you need to achieve higher voltage to strike the arc so we would either not use those alternators that have avalanche diode rectifier plates, or swap them with rectifier plates we would spec with non-avalanche rectifier plates. This current will be lagging the voltage due to inductors La and Lb, producing a lagging power factor. and you are using 60-70 amps. Make sure alternator-to-regulator harness plug. Firestone auto repair stated that the alternator was producing high voltage and causing issue with the battery. Like the others have stated check your voltage. Shorted or open diodes in the rectifier bridge may also cause this problem. Single wire alternators simplify wiring, but are actually less desirable in high performance applications! A typical alternator, for example, has a small low current control wire. charging too high. 7V- I suspect that will shorten battery life if left that way. So, as a summary, you should be measuring the voltage at the battery terminals. No need to replace the alternator here. More than about 1/10 volt says there's a "grounding" issue. i5 - rt Seems like the regulator circuits within the alternator has failed - it should be 14. The electrical system in an automobile is said to be a 12 volt system, but this is somewhat misleading. If the voltage dips below the optimal range, then the regulator kicks in to get the alternator to make more voltage. When the alternator dies you typically get the one "charge" light and a low voltage. The alternator is going to put out that max voltage at all times. Ideally, output voltage should be at or close to 120 or 240 volts. When im standing still and not moving, the voltage reads over 14 volts at about 15 until i start moving and then. Check for damaged components and look for broken, bent, pushed out, or corroded terminals. There is a screw under the tank when your looking in from the recoil side. The regulator is at fault if both the charging voltage and the field coil voltage are both either high or low. If voltage is greater than or equal to 13. Rotor field coil winding shorted. You can do pulls while measuring voltage at the battery, at the alternator, at the Megasquirt, wherever. x volts and not too high such as the 7. If the voltage is not that high, look to the engine mounts as being so hardened that vibration is killing the headlights. Engines must crank at about 200-300 rpm to activate the electronic fuel injection. If the voltmeter indicates 15 volts, that is indeed too high, where it is more likely to damage a modern battery than other components that tend to have protection built in. Step 4: Complications. and the other on the (+) output post of the alternator. The Batt says 12. 5 volts, the 0. One reason why alternators have a high failure rate is because they’re always working under a load. Also can cause unusual behavior of the car electronics. Checked the regulator and it was fine, pulled and rebuilt the alternator but it was actually working fine (benched properly but the bushings were almost done and the diode was a bit iffy). If the voltage does not change when the engine is started, if it does not get above 12 volts, or if it charges above 15 volts then the alternator may be faulty. Voltage regulator I would stray more towards a diode in the alternator or a. The original pulley diameter was 3 inches. and just looking for some advice. Didn't want to cause any damage to the car with the alternator outputting too much voltage. Do not operate at slow idle, operate at fast idle. "My car battery is charging at 15. Connect carbon pile tester across batteries. If one or both the readings were high, then there is a problem with the +/- cable or its connections. At the heart of the automotive electrical system is the alternator. In late model vehicles this is typically accomplished through a sensing circuit that informs the PCM of battery temperature and electrical system demands. Intermittent problems like this can be very difficult to resolve, so have patience and follow a systematic troubleshooting approach. That can be a problem if the max is too high. Plugged green field wire back in and got almost 19V, then pulled Voltage Regulator wire, and Volts dropped back to 11. If we use a diode at a higher current then the voltage drop will be higher and therefore the output voltage of the alternator will be increased by more. is the voltage regulator inside the alternator or is the voltage regulated by the ECM? cause were beginning to think the ECM is going bad. The amperage rating on an alternator is basically just the amount of current that the unit is capable of putting out, not the amount it always puts out. So one of the best indicators that the alternator is charging it, is verifying that battery voltage should be at 2 Volts over battery voltage (at rest) when the engine is running. Transistor burnout is the most common voltage regulator failure. If voltage is higher than this, alternator operation is not being properly regulated - suspect the remote voltage sense circuit and/or the voltage regulator. The charging system in most cars will generally produce a voltage between 13. Rpm's aren't that big of a deal. Replaced the alternator and the battery and the same high voltage still exists. 4 Loads and power factor. In most every case these alternators are nothing more than a light duty automotive alternator slapped onto a marine engine. If your battery voltage is less than 12. Charging voltage should be pretty close to 14 volts with the engine running and no headlights or other heavy loads. At the heart of the automotive electrical system is the alternator. Wiring Diagrams DVSR Conections HOUSE B A T T POSITIVE + S T A R T B A T T POSITIVE + House Batt Positive + (tinned stud) Start Batt Positive + (tinned stud) OrangeWire (remote LED indicator output) Black Wire (negative) Red Wire (ignition control/storage mode). The will get too hot to touch after running a while. If the alternator voltage output is high you’ll get: An unpleasant, sulfur smell from the car battery. With CARiD power shortcomings are in the past, because we carry a large stock of high-amp alternator styles for every budget and need. Plug the component back in and go to the next component. You can never have too much amperage when it comes to alternators; therefore, you never have to worry about choosing an alternator with too high of a rated output. The sense terminal, which is often labeled S, must always measure battery voltage regardless of electrical load.