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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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Wire loom clip behind Lexus alternator has little play

I was following along this lexus alternator replacement tutorial, and at 12:32, the guy uses a 10mm wrench to release the clip on the alternator L bracket very easily. I used his trick with much ...
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Briggs alternator identification

These are pics of the alternator, yes I have looked at the Briggs guide, the most similar one I’ve found is the 397880 but this does not have the capacitors on it. I’ve spent hours looking so maybe ...
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How likely it is that low alternator voltage cause Xenon HID headlamps ballast to fail?

It seems that the alternator is producing a bit low voltage, about 13.4V max, while this should be over 14V AFAIK, undercharing the battery. The left Xenon HID headlamp ballast failed some time ago, ...
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20.2 volts on the B+ terminal of a12v alternator.

The engine on my sailboat has an Iskra 12-volt alternator that has worked fine for over 3,000 hours of operation. Just recently, I noticed that the voltmeter shows no charging, ie, only about 12 ...
Chainplate's user avatar
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2010 Nissan Altima making noise, possible electrical that no one can help with.

Our 2010 Nissan Altima started making strange noises-sounds like knocking under the hood, especially when idling. No one can tell us what it is, when hooked up it doesn't register anything. I have ...
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03 BMW 540I M package Charging System issue

I purchased this vehicle in October 17, 90 thousand original miles 3 different owners according to carfax. Car was in perfect condition, I personally kept in garage and rarely got out for the first ...
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2009 Kia Spectra P0507 code thrown after alternator replaced at the shop

Have a Kia spectra, 2009, and just had the alternator replaced at the shop, it started a little hard and idled a little low off the bat, drove it 25 miles home, idle seemed a bit higher than normal ...
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battery light comes on mazda tribute

2001 Mazda tribute v6 with a NEW alternator. Will start from beginning to be clear. Original alternator went out 3 years ago. Was replaced with after market, this worked for 3 years, was replace ...
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Car makes rattling sound after shifting gears?

Recently after I got my alternator and battery replaced, I noticed that after a night or two whenever I tried to start my car (after engine turned on), I heard a rattling sound if i started shifting ...
夢のの夢's user avatar
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2005 nissan altima alternator getting hot

I have a 2005 Nissan Altima 2.5 liter. The first issue is that my belt was vibrateing badly when I would run the air conditioning. I came to find out it was a pulley on the alternator that was bad. ...
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I have a 2009 Honda Accord 2.4 and I replaced the battery and alternator and the car will not keep running. Its not holding a charge

Hello my 2009 Honda Accord won't seem to stay running after I replaced the battery and the alternator. We took the battery and alternator to get it tested and is still good, so I was wondering what ...
cool kash's user avatar
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power inverter to run a shop vac. Could alternator be damaged by this?

I have a standard 200 watt power inverter which I have used to power a sound system off of my Econoline e250 on multiple occasions with no problem. I tried to run a 4hp rigid shop vac off of it and ...
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How to make sure if my car has a tow package?

I have bought a used 2008 Highlander Sport. I guess it has a tow package installed as I see the tool in back of the car but I am not sure if it is a OEM or aftermarket. How can I make sure about it? ...
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Alternator starts arter hitting gas

I have a Citroen C3, 1.4 year 2002. This car gives me headache. I have problem with alternator that doesn’t start until I hit the gas. I have changed battery, changed ground cable, changed alternator ...
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2015 Honda Odyssey. How to charge my APU only when the car battery is not being charged?

I have a 2015 Honda Odyssey and an APU (battery) that I want to charge at 400W (on the highway). To avoid overloading the alternator, I want to charge my APU only when the car battery is not being ...
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Alternator doesn't charge the battery when idle with head lights on

My car is a Mitsubishi Magna TH 1999 3.5L Auto. The alternator gives no voltage at idle with headlights & fan on. The battery gets drained. The alternator warning light pops up. If revved a little ...
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Long crank time when engine is warm/after car has been driven

My car has about 155,000 miles and it's a Toyota Avalon 2008 V6. A few months ago, my battery died and I got it replaced at AutoZone (by someone who, I found out, wasn't qualified). My car sounded ...
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Need a alternator for a 94 nissan pathfinder Le V6

I have a 94 Nissan Pathfinder LE V6 and I wanna know if there is any other parts that would b compatible or a perfect fit for my suv beside an D21 hardbody, altima wit a v6 motor or an Infinity G35 I'...
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VW Polo battery question

My (VW Polo SE TSI Mk5, 2015, 1.2, bought secondhand) car just had a new battery fitted (EFB for start-stop cars) and on checking the battery voltage with a multimeter at idle (engine on, car ...
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Voltage drop on 2009 Toyota between alternator and battery

New battery keeps dying slowly. I get 13.7 volt output at alternator but only 12.8 at battery. Thinking that voltage drop due to bad wiring between alternator and battery. Trying to trace wires but ...
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How often should I check my alternator?

Last week the alternator went out in our van while were passing through a less-than-desirable part of town. Nothing scary, but it was a long process that took an entire afternoon to get it towed to ...
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New alternator new battery

So my Toyota Corolla 2005 alternator went bad so we purchased a new one off Rockauto.com first time for me personally anyway so after replacing it and reconnecting everything I plug my Battery which ...
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03 yukon electrical

Its an 03 yukon with a brand new battery in it. In the past 3 months it has went in for a no crank no start issue twice . Both times it was just an ignition fuse. Something is causing this fuse to be ...
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Brand new alternator: only 2 Volts

I just installed a brand new alternator in my car. The output voltage is just above 2V regardless of engine RPM. The exciter voltage from the battery is A-OK. The previous alternator had the same ...
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Ford Focus 2 alternator not chargin battery

I own a Ford Focus 2.0L Duratec(European version). Since some days ago I noticed a slight noise, like a very little vacuum cleaner and the alternator is not charging, for some moments I have 13.2V, ...
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My Alternator Case to Battery Negative is reading 12 vdc and same for the Case to Positive side

just had tranny replaced last week. The alternator that was on the car had been replaced in May of this year. I drove car for at least 1000 miles since the tranny was replaced. But, last night the ...
JPNissanAltima2016's user avatar
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Distinguishing bad alternator diode from short

Is there a good way without disassembly to distinguish between an alternator with a bad diode and a high resistance short in the alternator (between the output and housing) caused by moisture/...
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My car battery light is on

I have a 2010 Toyota Corolla S. Today, after driving around for 15 minutes, when I parked, my battery light came on. I took it to Autozone. After checking my battery and the changing system they said, ...
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Car that I drive regularly has flat battery, bad alternator?

A car that I pretty regularly drive everyday has just had it's battery run flat. I had just got back from a 30 minute drive and 10 minutes later tried to turn it on and it just kept cranking like a ...
Vehicular IT's user avatar
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94 head gasket replacement now my car wont start

I replaced my head gasket and once I got to putting everything back together my car wouldnt start it wont crank and I have no power going to my car and suggestions
Jose Jose's user avatar
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1 answer
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2007 Mercury Montego V6, Need to test the alternator output independent of the wiring harness and computer

We've had the alternator rebuilt once and replaced it entirely with a brand new one. We've replaced the battery twice. Mechanics keep insisting it's the alternator. And I quote "it's never the ...
Cliff Armstrong's user avatar
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Alternator going out or Power steering.....?

Got a 2009 Honda Accord that's been idling a little rough and shuddering/vibrating. When I turn the steering wheel, RPMs quickly jump from 500 - 1100 and then quick drop down and car sputters like it ...
John Wilkkis's user avatar
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brushless alternator with external regulator

I'm interested in using a Delco Remy 38si with an external voltage regulator. Obviously, the voltage regulators can be removed on these units, but I'd like to know whether anyone has modified one (or ...
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2011 Ford Mustang Gt "Check Charging System" light after changing alternator

My mustang started showing a code for "camshaft position sensor" so I replaced it. 1 day later, it came back on, same sensor so I started doing research. Everything I read said it was probably the ...
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1 answer
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Total Electrical failure Mondeo 1.8tdci 2008

While charging a flat battery all on the Mondeo all of the electrics failed (lights, dash, not starting, Windows, ect) when I installed a new battery on the Mondeo still nothing. Any ideas on what ...
DarkieBluebell's user avatar
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Car engine got wet through low water pass - any potential unseen damage?

Last night it was raining hard. There was a bridge that was flooded but I couldn't tell because the ruler marker sign was knocked down. As I approached it the car got deeper and deeper into water. ...
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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 ...
fireshark519's user avatar
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1 answer
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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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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 ...
user45316's user avatar
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1 answer
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1986 Nissan D21 Connector Part

What is this? As a hint, I'm losing about 2 volts between the alternator and the positive terminal of the battery here. It appears to be the last connection on the way back to the battery, just after ...
jstaab's user avatar
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2 answers
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Alternator on a boat generating 90Amps for three batteries ACR system

After several hours of thorough research, I still haven't found a satisfying solution to my problem. My electrician bought a 90 amp alternator for my boat and I count on charging three batteries ...
Marc Meunier's user avatar
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Building E-Bike Help

I am building an e-bike using an electric skill-saw, a car alternator, and a 20Ah battery. I have a few questions because I am new to this stuff. Should I have the motor in between the wheel and the ...
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What could cause premature failure of a brand new alternator on my 2007 Ford Escape?

The (I believe original) alternator on my 2007 Ford Escape failed last month and was replaced with an alternator from FVP. The battery was tested and seemingly passed muster. Now, three weeks later, ...
unknown222's user avatar
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284 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 ...
jeff's user avatar
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-1 votes
2 answers
840 views

Renault Master Battery/Charging Problem

I'm having some alternator charging issues with my Master since 1 month, today it got much worse. It is 2016 with 135k km. Car shows up STOP and Low Battery warning, when it first started happening ...
beydogan's user avatar
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3 answers
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Car battery is flat, how can I tell the cause from multimeter results?

my car battery is flat. I did some measures with a multimeter. I will explain them below. Can anyone please tell me what can be the issue? Note: My car is a VW Polo 9N3 2007 Symptom For the last 2 ...
thenewasker's user avatar
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1 answer
29 views

1999 taho gas engine alternator check

Had alternator checked but my negative terminal is loose would that give a false reading .. it's really loose and says the part is bad yet when I drive the vehicle it stays in the middle like normal ...
Phil's user avatar
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-2 votes
2 answers
868 views

Could a wind turbine work for a car?

Could I attach a little fan to power a motorcycle alternator to be more efficient then running off the engine? Attach any where facing the wind on the vehicle to increase mileage from eliminating ...
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