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 ...

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4
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2answers
11k views

Mustang charging system warning light on, but battery and alternator both passed testing?

I have a Mustang that the battery light stays on. I changed the battery and the alternator was checked by Autozone, they said it was good. I need help
4
votes
1answer
60 views

The Testing Procedure for the Mazda 626 Alternator in the WSM is Unclear

I have some questions regarding the alternator testing procedure outlined in the 98 US work shop manual ( this is related to my battery warning light question ), my car has the FS engine: When it ...
4
votes
2answers
21k views

diagnose faulty voltage regulator causing battery overcharging?

I've been having an issue with an '03 Toyota Echo. The alternator died (at least that is what I thought) as the battery kept going flat. I found an alternator at a wrecker and fitted it, and I ...
4
votes
1answer
3k views

How to repair alternator slip rings to stop squeaking?

Background I have a new Bosch CS-130 style alternator with a couple hundred miles on it. Since I installed it, it's been a little noisy, but I attributed that to the brushes breaking in to mate with ...
4
votes
1answer
124 views

Battery light flashing after alternator install on 2004 Ford Escape

I just put new alternator on my 2004 Ford Escape, and now my battery light keeps flashing on and off, and it will sometimes stay on. The battery has been checked and is charging 100 % . The alternator ...
4
votes
2answers
4k views

What is the correct/factory wiring for a Suburban 1998 battery/alternator?

I have included a picture showing what I have now on this Suburban. Note that there is wiring not shown in the picture which is a second electrical connection to the positive side of the battery ...
4
votes
1answer
29 views

Is the diagnosis from a battery/starter/alternator tester meaningful?

At many auto parts stores they will test - often for free - a vehicle's electrical system by attaching a device to the positive and negative terminals of the battery. That's all they do. Then you ...
4
votes
2answers
92 views

1998 BMW 318is excessive current draw - possible starter issue

My 1997 BMW 318is started making a whirring noise that varies with engine speed, and an electrical burning smell after driving, and the battery goes flat very quickly. I measured the current draw ...
4
votes
2answers
8k views

how fast does the alternator charge the battery?

It would appear that the common word of wisdom is that car alternators provide 50A of output. I actually looked at the supposed specs for my 2008 Jetta 2.5L on the internet -- a compact car -- and it ...
4
votes
1answer
64 views

Hyundai Accent Diesel 2002 alternator works on day but not when headlights are on

I have purchased Hyundai Accent diesel 2002 four cylinder from my savings .. its start every morning but not at night when the car's headlights are on. I couldn't start it after one or two attempt . ...
4
votes
2answers
25 views

Grind/Crunch Sound Near Alternator (video)

1983 Chevy 305 small block. Hearing a grinding sound near the alternator. Is this a bearing or something grinding near the belt ? Not exactly sure how to diagnose. Video: https://www.youtube.com/...
4
votes
2answers
31 views

2006 vauxhall astra keeps having battery drained and wont start

Hi i bought an 06 astra in october and since then its had 4 batteries and a new alternator but it still dies over night. I was told potentially the radio was draining it and that was a knows fault. I ...
4
votes
3answers
78 views

What alternator failure modes create excess drag without making allot of noise?

I was wondering in what ways could an alternator partially fail such that it would create excess drag on the engine ( enough to cause some shaking / lugging ) but not make any immediately apparent ...
4
votes
1answer
27 views

98 jeep wrangler 4- cylinder charging problems

My jeep check engine light came on. My volt meter went to 0.1. I changed the alternator and it worked for about 10 seconds and it went out. I installed another one and it did the same thing!!! What ...
4
votes
1answer
60 views

How does the ignition system control the Energy of the spark?

An automotive ignition system needs to provide a specific amount of energy to properly ignite the air/fuel mixture in the combustion chamber. Energy = voltage * amperage * duration. A specific ...
4
votes
1answer
93 views

Alternator/Battery power question

Good Afternoon, I have a 2014 Ford Focus SE that i use as my Work Vehicle. I work in Emergency Roadside Assistance. I have to run a laptop In the car in order to direct calls to other employees and ...
4
votes
1answer
391 views

How long should fusible links be?

I've installed a 12" fusible link as a replacement for a fusible link on the line that charges the battery from the alternator. I showed the OEM part to the guy at the parts store and he gave me a 12" ...
3
votes
2answers
658 views

Safe resistance between alternator and battery?

I am trying to figure out which awg of wire I need to get for my new, 160 amp, alternator. I found this chart which shows the resistivity/length of different wire gauges. Chances are that I will not ...
3
votes
1answer
4k views

Battery dash light comes on when starting car then disappears while driving

2002 Honda Civic EX here. When I start my car, my battery dash light has been staying on usually until I get onto the highway, then it will turn off. If I hit a stop sign or red light, then it'll ...
3
votes
2answers
816 views

'03 Mazda Tribute needs jumped every time it starts

I have a 2003 Mazda Tribute. I'm not entirely sure what the problem is with the vehicle. I suppose it could be the alternator or just a dead battery, but could also be something more detailed. I have ...
3
votes
3answers
392 views

Should fuel pump noise be changing according to electrical load and RPM?

One thing that bugs me about my car is that the fuel pump noise is fairly inconsistent. Turning on the lights, aircon, defroster, etc. lowers the fuel pump speed and gives a lower pitched noise. It ...
3
votes
2answers
5k views

Why did my car stall when I used the foot brake?

Preface: I drive a 2004 Peugeot 206, manual On the motorway the other night, one of my tires blew out. I managed to pull over and change to the spare wheel in about 30 minutes (having never changed a ...
3
votes
1answer
26 views

Missing a bolt to take out to remove alternator 2001 Nissan sentra

I am trying to remove the alternator from my 2001 Nissan Sentra. I have taken the belt off, have taken a screw out of each the left and right side (looking from the front of the car). It seems like ...
3
votes
3answers
2k views

Toyota Celica battery light on but alternator appears okay on visual/auditory inspection

Today the battery light decided to rear its head on my Celica. I know this normally points to the alternator, but given that I just replaced a bad alternator in my Chrystler, I can tell what a bad ...
3
votes
3answers
14k views

Battery light comes on after starting the car. How big of a problem is this?

On my way to work this morning, the battery light came on. I would say it was about 2-3 minutes after I started the car. My drive to work is only a 10 minutes drive, and the light was on the whole ...
3
votes
1answer
32 views

Is my voltage regulator really bad?

Yesterday, my wife's car (a 2009 Toyota Sienna AWD) wouldn't start, and this came clear out of the blue. A jump fixed it. We let the car sit idle for a good 30 minutes, and it was able to start up ...
3
votes
2answers
209 views

Why did replacing the battery eliminate these symptoms?

I have a 2006 Honda Civic SI. It was slow to crank when starting up, and while driving, electrical systems progressively got worse (radio would turn off and on, power steering would stop, and then ...
3
votes
1answer
33 views

2004 mustang v6 new altenator and battery

I just changed out my alternator and got a battery last week. We can jump the car and the car will drive. While I was letting it just sit to run to charge more the car cut off and nothing happens. ...
3
votes
1answer
3k views

Car won't start - replaced alternator - didn't help

I have a 5-6 years old Mazda 6 2010, 2.5L engine. My car simply won't start. I had this issue yesterday, so I called roadside assistance and they were able to jump start my car. I drove straight to ...
3
votes
2answers
238 views

2004 Nissan Altima with new alternator won't accelerate, but will rev in neutral. No power in car.

Hey internet mechanics! I replaced my alternator yesterday because it was faulty (pulling a charge from my battery and killing it every night while car was off). After installing the new alternator, ...
3
votes
2answers
4k views

Nissan Altima Alternator/Battery Problems

I own a 2005 Nissan Altima which has been having alternator/battery problems for past 1 year. My car has 112,000 miles on it. My car battery was past warranty so I had the battery replaced about a ...
3
votes
0answers
9 views

Cant Start 08 Civic (Diagnosis)

So I just bought this 08 civic LX (110k miles). After a few days of flawless driving, we noticed a couple wires NOT connected that were coming from the hood opener-sensor thing. Plugged them together ...
3
votes
0answers
29 views

Is battery bus voltage available via OBD2 scanners for 98 Avalon?

In order to supplement the inadequate-by-design alternator BIT circuits in my 98 Avalon (alternator failures have stranded us; no instrument panel warnings of charging failure), I'd like to either ...
3
votes
0answers
35 views

Turning on Loads caused an Increase in Alternator Base Voltage

I've been having some strange low voltage problems lately. I was messing around, and decided to turn on as many electrical loads as I could, which meant the radio, high beam headlights, defroster, ...
3
votes
0answers
38 views

Citroen C2 Alternator

Please if someone could help me ill really appreciate it. I've got a Citroen C2 the Bendix of the starter was completely worn so we purchased a new starter and put it in. At first it started. Once ...
3
votes
0answers
68 views

Typical voltage drop when air con, radio, lights, etc. in use

Imagine the engine/alternator are running and the battery voltage is 14V. If I now turn on the air conditioner, radio, headlights, seat warmer, cigarette lighter, should I now expect the voltage to ...
2
votes
3answers
676 views

Are inverters bad for your car?

I bought a Duralast 130W inverter and it says 260 peak watts and it plugs into the 12V cigarette lighter. I want to charge my HP laptop with it. Is it bad for the car?
2
votes
3answers
2k views

Is rebuilding an alternator a DIY project?

I'd like a high performance alternator similar to one of these. Is it possible to rebuild a stock alternator to similar output, using majority of tools one would have at a home garage? Of course one ...
2
votes
3answers
144 views

Effects of significant draw on alternator and battery

Hypothetically speaking, let's say I've equipped a vehicle with an aftermarket audio system with an amplifier that has a higher draw (in amps) than my alternator produces causing my average voltage (...
2
votes
2answers
1k views

Is alternator rating at pulley rpm or engine rpm?

I just got a new alternator for my jeep that says 160amps at 2k rpm. Is this rating for the pulley rpm on the alternator - or is it the rpm of the engine? Also, if the pulley is spinning slower than ...
2
votes
2answers
59 views

Timing belt replaced, engine dies after jump starting

I had the timing belt replaced on my 2005 Chrysler. I drove for a week, and it appears the battery died. I used jumper cables to start the car, but as soon as I took the cables off the engine died. ...
2
votes
2answers
304 views

Does intermittent starting difficulty indicate alternator or starter?

Tl;dr: Car is having trouble starting, and I'm wondering how to determine if it's the alternator or the starter. I don't experience the longer turn over times of a typical starter malfunction, but I ...
2
votes
1answer
194 views

Car stalled and restarted after some minutes

I have a very old car which uses mechanical transmission (Maruti Zen) Recently while driving on the road, I switched off the engine because of heavy still traffic. I forgot to turn off the head ...
2
votes
3answers
9k views

Rover 25 - My battery light starts flickering on/off on the dashboard

My girlfriend noticed this yesterday and thought it was odd, it stopped but started happening again this morning on my way to work, I think its a V plate.... "as I’m driving along my battery light ...
2
votes
2answers
157 views

How can I identify which alternator is the right one?

I need a replacement alternator for my 1993 VW Mk1 Cabriolet (aka Rabbit). Unfortunately, the identifications on the old alternator are painted over. I cant ID it. On sites I've looked at there ...
2
votes
1answer
31 views

Bad voltage regulator?

1999 nissan altima. Battery and brake light came , had it tested at o'riley alternator tested bad voltage regulator. Replaced with rebuilt alternator. Cranked car, lights are off everything is good ...
2
votes
1answer
79 views

Amplifier is causing battery drain

Okay I'm driving a 1998 Honda Civic EX and I have an audio system in my car that is about 7-8 years old now. I had done some work on one of the terminals on the subwoofers, and melted plastic in ...
2
votes
1answer
173 views

Alternator voltage range

I'm just trying to figure out the normal operating range of an alternator. The best I've found is: http://www.f150online.com/forums/electrical-systems/469058-alternator-high-voltage-15-3v.html ...
2
votes
1answer
698 views

Chevy Malibu 2009 won't start

I have a 2009 Malibu, yesterday I was heading back from school, then I started hearing a bizare sound like a whining sound, 2 minutes afterwards the engine stopped. When I got off to check under the ...
2
votes
3answers
492 views

98 Tiburon won't start and doesn't make a noise

I have a 98 hyundai tiburon. recently the battery light went on when I was driving. the next day my girlfriend left the headlights on and the battery died. We tried to jump it with no luck. I got the ...