Questions tagged [alternator]

An engine accessory which generates alternating current (AC). The electricity is then fed through diodes which converts it from AC to direct current (DC), which is usable by the automobile in general. The alternator is usually driven by belts which are connected to the crankshaft of the engine which provides the motion to produce power.

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26 views

if my alternator was tested and functioning properly why does my battery and brake light keep coming on in a 08 nissan altima 3.5

started my 08 Altima and put it in gear and it didn't have the power to go anywhere and then the car just died. bought a new battery and everything worked fine. now my battery and brake light on the ...
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electrical voltage drop

I have a volt meter gadget plugged into the cigarette lighter socket. It used to read at 14.3 volts when the car is running. Suddenly it dropped to 11.2 volts without any accessories or lights on. I ...
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Squealing, smoke, and oil on engine

I recently bought a 2005 Ford Focus, only had it for 2 weeks and never had any start up issues or weird noises, yesterday I went to the movies with some friends and after a 16min drive to the theater ...
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Can starter be used as an alternator?

There's probably a legitimate reason why we have 2 different parts for doing 2 different jobs. However an electric motor can also be used as a generator. If the design allows it, why isn't starter ...
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Alternator sudden voltage drop after engine running for 2 minutes

My battery lamp in the gauge cluster turns on after the car have been running for approx 2-3 minutes. I have measured the voltage and when I start the engine and when it's running for the first 2-3 ...
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How can I test alternator

The voltage of my car battery is not fixed when AC going to active. In fact, I saw that the voltage dropped when the compressor clutch turns on. I suspect alternator and battery. Now I want to test ...
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Can an alternator maintain a good system voltage (14 volts measured at battery terminals) but not be supplying enough current?

I'm reading a car electronics textbook that claims that an alternator can maintain correct system voltage (say, 14 volts) when under load, yet not be outputting enough amperage. I can't understand how ...
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Alternator dying so junk car?

The alternator store rounded the bolt on my alternator so I can’t get it off my 2004 g35x. I changed the belts (there are two one for ac and one for alternator) since I did that the car has a voltage ...
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2002 Mercury Mountaineer V8 4.6 2W Drive

While driving on freeway going 75 MPH using cruise control, my engine stops running. I still have lights and power but no power steering or power brakes because engine was off. I put it in neutral and ...
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44 views

Alternator problems: First too much voltage now not enough

I had to put in a new alternator in my 99 Isuzu Amigo. The old one burnt up. Everything seemed fine...output was around 14.4 volts, however, the plug that goes to the "S" & "L" terminals on the ...
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54 views

How can a battery indicator be on when the alternator is providing adequate voltage?

I'm under the impression that the battery light indicates that charge is flowing "out of" the battery. Normally the battery is being continuously overcharged by a couple volts, meaning that electrons ...
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2003 Mazda Tribute lost power

I have a 2003 Mazda Tribute with the V6. The battery light will occasionally come on, sometimes it just flashes, other it stays on. I had the battery and alternator checked at two different auto parts ...
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Charging two 12V batteries wired in series by two car alternators

I have a spare engine sitting around and i've been planning on building a 220V generator from it. I'll be using an old UPS device which uses two 12V batteries wired in series to make 24V and connect ...
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127 views

ABS and Brake light fault after battery disconnected

I bought a new battery that ran flat after two weeks. Took it back to the garage and they disconnected negative from my battery whilst the engine was running to check my alternator but now I have ...
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Battery Charging Fault

Renault Grand Scenic 2010 MKIII (I believe). I've had this problem for 2 years now, I had battery replaced and had it tested several times but no one seems to find the issue. There is no clear ...
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Little/no charging but alternator and battery test good

For the past few months, and seemingly getting progressively worse, I've had a charging problem: both battery and alternator test good (checked via charger with alternator test mode and higher-end ...
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137 views

Car starts when jumped but will not start again after turning off

2006 VW GTI 220k mi. 1yo battery. Starts and runs fine after jumping, but once I turn the car off it will not start again. No lights come on the dashboard, wont even click on attempt to start. Is ...
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Alternator issues

Any help...I’m out of ideas. Alternator issue, getting too hot to touch. Any help would this would be greatly appreciated: Wiring as is, (alternator neg grounded to engine, positive to starter, ...
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Anti Pollution Faulty

I have a 2006 Citroen C2 VTS ... At first it did not start and I exchanged the coil pack and the car was fine. Took it out for a test drive a few blocks down the road it cuts out. I switch it off and ...
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58 views

How is the battery on my riding mower charged?

I just started my riding mower for the season and in doing the basics (oil change, spark plug, air filter cleaning, take the trickle charger leads off) I was looking at the mower and realized I didn't ...
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Battery light still on after alternator change?

I hope I'm allowed to post this here... If not please disregard and know that I'm sorry. My 2004 Mercury Monterey broke down last night (all electronics shut off and it came to a sputtering halt) due ...
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1998 Suzuki Intruder 1500VL Back Fires After Replacing Alternator

The bike has ran fine for around 100 miles just days before I replaced the alternator / magneto because it wouldn't keep the battery charged and would barely maintain while running high RPM's. ...
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113 views

Alternator belt whining when plugged in only

There's a friend of mine who has a car (2007 Suzuki Swift petrol 1.3L DOHC 92hp) which has been making a whining noise for a while, the alternator belt broke once few months ago, and during it was ...
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Should I Replace The Alternator or Try Something Else First?

I have a 2012 Mercedes Sprinter 2500. I had a no start morning a couple times in the last few weeks and finally the battery would hold no charge. I took it in and was told it came back as need to ...
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Alternator amperage to charge 3 batteries

I have a 2009 accord sedan, with a sound system installed. How many amps should my alternator be to charge my 3 batteries? My OEM alternator currently puts out 130.
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Mazda DP alternator problem Replaced regulator now car swings but doesnt start Seems like no spark

ECU controlled alternator Could it damage ECU if the pin was left in the brushes after assembly? After new DP regulator was fitted car has no spark.
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12v starter battery True amps available why volts come back so fast by running engine 5 mintues?

The OEM start battery on my new van is 70AH, 120RC. I have a 12v freezer that consumes about 3amps @ 12v. It takes the freezer about 6 hours to freeze a gallon of water. My battery is not a deep ...
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Exciter Circuit Oddity

When doing a timing Belt job in my 1987 Porsche 928, we cleaned up the engine bay and made sure the electrical loom associated with T18 (an under the hood terminal connector) was routed and secured ...
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2001 Crown Victoria alternator exiter wire

My 2001 Crown Victoria appears to have a short somewhere in the harness which is going to be hard to find. As a temporary fix - can I connect the alternator exister straight to the battery? Is it ...
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163 views

2002 Subaru Legacy GT - New Alternator, Battery Light Stays On

I recently had to replace my alternator as the one original to the car died after 180k miles. The new unit is a Subaru re-manufactured alternator purchased from the dealership. The original failure ...
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alternator overcharging

I had a bad TPS on my 2009 Montana. I replaced it with a used scrap-yard TPS and the car runs great now. However, now my dashboard meter reads 15v. It's the uper limit, but it used to be 14.2v ish ...
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51 views

Problem with starting a car

I had a problem 7 days ago: I could not start my car. Temperature on that day was -17 (-27°C ). I heard just 1 click and that's it. One day later it was 32F (0°C) and I could start the car. I could ...
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Isolator or Separator for my Hitachi alternator

I am looking to charge an auxiliary battery for my motorhome, but am not sure if I can use an isolator given the alternator. It is a Hitachi LR160-78B 60a alternator in a 1985 Nissan 720 pickup (...
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Dual alternator setup that is separated one alternator and battery runs the truck one alternator and battery runs the audio system

Hey guys I'm JD and I've got a 2008 Chevy Silverado extra cab 4 by 4 flex fuel truck with a 5.3 l vortec I have added a second alternator and second battery!! Separated the way this thing works the ...
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I accidentally hooked the negative side of the battery up firstand the wire running to the alternator started to smoke

I accidentally hooked up negotiate cable to battery first causing the wire running to the alternator to smoke. I quickly unhooked it and hooked it up positive side first. But now my car won’t stay ...
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119 views

Is a 13.07V alternator voltage too low?

I'm having some problems with a 2006 Mini One D (1.4 l diesel engine). About a month ago the alternator warning light turned on (it only turned off over about 4000 rpm). The belt looked good, so I ...
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S10 won't start

I have a 2002 s10 that won't start. I had work done to repair an oil leak, drove it home, and it died. Thought it was maybe the battery, which had, in fact failed. I replaced the battery, and it ran ...
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31 views

1990 F-150 Eating Alternators

My old truck has a problem with zapping alternators. It's a 1990 F-150 with a 5L V8. Specifically, I believe the voltage regulator is going out. Giving it a lot of gas seems to always be the event ...
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Battery dead. Why won't my car start when jumped?

I have a 2007 Lexus ES350 with about 185K miles on it. I've owned it for about 14 months, never had a problem. Over the past couple of days it was sitting parked in my garage. I'm not sure, but the ...
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What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?

What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?
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346 views

Camry new alternator and battery, car wont start

I have a 2003 toyota camry xle, recently the car has died after the battery light came on. the battery read 12.5 volts and after jumping the car and removing the battery it died suggesting the ...
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Starter motor or Alternator?

Can anyone offer any advice? Got in my car on Monday and it was dead. I turned the key and there was no noise at all, but all the lights etc came on. No clicking or anything. I got a jump start and ...
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New alternator whining?

I have a concern about a new alternator I put on my 02 echo, again it too does not have a tensioner. Belt tension is created by pivoting the alternator away from the engine. This was the first time ...
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Boat Alternator Charging 4 Batteries 70 Amp Draw 50 Amp Charge

This is the current situation, looking for some expert advice. Total amp draws with night time running lights + GPS + other accessories I am at about 70 amps. My alternator puts out max 50 AMPS ...
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412 views

Voltage measurements with the alternator running fluctuate

I own a 1994 Mazda Protege. On Sundays, I measure the voltage at the battery terminals, and register it. First with the car turned off, and then with the car idling. The voltage with the car turned ...
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Alternator voltage constant with revs and battery light on

I recently installed a new aftermarket alternator in my 2006 Lexus is250 and checked the battery to make sure it was good. After installation, the charging system warning light is on and I can't ...
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49 views

Alternator issues?

I have a 2005 GMC with a 5.3 vortec engine. The alternator failed and I replaced it with a used one out of a previous GMC I still own. It would not charge more than 12.45 volts below 1000 rpms. At ...
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242 views

Is it possible to charge a small auxiliary battery with the alternator?

I want to charge a small 22AH AGM auxiliary battery just to turn on some light signals. I would like this battery to be charged by the alternator while the car is running. The problem is: the battery ...
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49 views

Alternator misconnected, what adverse affects

Spent the night and the very early morning in the garage changing the clutch on my wife’s 1997 Mk3 Golf GTI 8V 2.0. She’s called me saying the battery light is staying on. When I’ve thought about it,...
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Could installing a 12V radio on a JDM Simpa damage the battery and alternator, causing the alternator to put out no charge?

I am a Canadian living in France. I bought a "voiture sans permis" (JDM Simpa) for my son to go to and fro school... It is essentially a very small motor vehicle which can only go up to 80 km per hour....