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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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1 answer
656 views

Alternator connection is bad

So I have a problem where one of the wires connecting to the alternator comes loose and stops charging my battery. I have an 08 Honda Accord. I have pulled the wire out and attempted to clean the ...
0 votes
1 answer
21 views

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 ...
0 votes
2 answers
177 views

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, ...
1 vote
3 answers
7k views

Brand new lead acid car battery reads only 12.33v. Is it faulty?

Yesterday I purchased a brand new, maintenance-free, 12 volt lead acid car battery. Specs: 47Ah and 450CCA. Before I install it in my car, I measured the voltage with a catIII digital multimeter. It ...
1 vote
2 answers
460 views

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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1 answer
2k views

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 ...
2 votes
2 answers
51 views

Bad battery connection as reason for failed alternator?

I'm totally new to car mechanics. The other day the battery died on my 2006 Toyota Camry. I jumped it but it would not hold a charge so I brought the battery into a mechanic to have it tested and they ...
1 vote
1 answer
21 views

jeep wrangler 1999

went to drive the jeep this morning and it showed the battery was low, check gauges light, squeaky sounds coming from under the hood, and the blinker sounded different. I went home and then tried to ...
0 votes
2 answers
160 views

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 ...
1 vote
1 answer
4k views

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 ...
0 votes
1 answer
127 views

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 ...
0 votes
1 answer
861 views

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 ...
1 vote
1 answer
116 views

Will a 12v alternator/generator connected in parallel to the vehicle alternator cause damage long term?

I am a computer systems administrator and I've don't basic work on my car but haven't done anything significant with car electrical. I have an overland/adventure truck I'm building with a battery bank ...
1 vote
1 answer
413 views

Alternator gone bad after collision repair

I have a 2011 Honda Accord (92k miles, being driven about 10k/less per year) that was recently involved in a low-speed front-end collision (I rear ended a car in front of me at a stopped signal when ...
0 votes
2 answers
69 views

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 ...
1 vote
2 answers
817 views

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 ...
1 vote
1 answer
2k 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 ...
0 votes
1 answer
55 views

jump starting car: why wouldn't jump start work when bad battery is more depleted

Please see pic. I was able to jump start on day 1 on first attempt. After the bad battery depleted more over the weekend (day 3), I was not able to jump start easily. I kept trying for 30 minutes, ...
1 vote
0 answers
53 views

What does this alternator diode test tell me?

I have the battery disconnected (pos and neg), and nothing is connected to my alternator. When I connect a multimeter's common (black) to the positive pin and the red to the alternator housing, I get ...
2 votes
1 answer
72 views

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 ...
0 votes
1 answer
213 views

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 ...
1 vote
1 answer
213 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 ...
0 votes
1 answer
168 views

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 ...
0 votes
1 answer
36 views

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'...
1 vote
1 answer
160 views

12 to 24v charging with isolator

I'm trying to find the best way to charge my 24v solar battery bank off my 12v bus system. The simple way seems to be a step-up converter and a diode, but I'm wondering if I can replace the diode with ...
1 vote
1 answer
148 views

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 ...
1 vote
2 answers
311 views

How can I get my H.O. alternator to charge at 14.Xv?

I recently installed an Eagle High 250amp H.O. alternator in my 2015 Altima. Immediately upon starting the engine my battery light came on. I hooked up my OBD-II scanner and it shows that the CPU ...
0 votes
2 answers
282 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 ...
1 vote
1 answer
123 views

2010 Kia soul car not staying on after removing jumper cables

Car wouldn’t start so used jumper cables to start car. However, after removing jumper cables lights dimmed then car died. 2nd try Jump starting car removed cables and was able to keep car running ...
-1 votes
2 answers
788 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 ...
1 vote
0 answers
51 views

Battery discharging with new alternator

2007 Chevy Cobalt So I recently replaced my alternator, at first it was working fine, the socket meter I have showed a consistent 14.5V reading, but after turning it off and later in the day start ...
0 votes
1 answer
46 views

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 ...
3 votes
1 answer
207 views

What are the effects of upgrading battery size/power in 2012 Civic LX

I found Upgrading Honda Accord Group 51 battery to a larger one but it answered one of my questions. 2012 Honda Civic LX, 1.8l Battery stock size is 51R, but they only get about 4-500 CCA. We live in ...
1 vote
1 answer
34 views

2006 Accord EX: replace alternator diodes or entire alternator?

The OEM alternator was removed and tested at Advance Automotive because of measured voltage drops. The test did not find anything. We suspect that the rectifier diodes may be at end of life. Are ...
2 votes
1 answer
86 views

2014 Elantra. Put new battery in mechanic checked it over said solid car. Last night coming down I75 everything went out but motor. Now won't start?

2014 Elantra..Put a new battery in a few weeks ago and a mechanic checked everything and said it's a solid good car. Last night I was coming down I75 and everything shut off/went out but the motor ...
2 votes
1 answer
157 views

Heard bang while driving, car wont start

I heard a bang right after shifting gears and I suddenly lost power to my radio and power steering. My engine was still running fine after the bang. But when I shut it off I couldnt start it again. ...
5 votes
3 answers
974 views

faulty alternator problem?

I have a 2002 mitsubishi magna, battery light came on intermittently one day and a few months later the car died mid drive, battery completely dead. i got a jump start which lasted about a minute ...
0 votes
0 answers
52 views

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 ...
1 vote
0 answers
91 views

07 Ford Edge: battery and alternator problems

Replaced alternator, fuses, temperature control sensor, the plug that goes to the alternator and battery. The battery light comes on a few minutes after crank. We check the voltage on alternator and ...
0 votes
1 answer
71 views

Battery dead after track day but everything working

Car: BMW M3 (2006) I went to a track day (HPDE event where I drove the car on a road course at its limit for the entire day) and at the end of the day the car wasn’t cranking. I push-started it and ...
0 votes
1 answer
51 views

02 Honda civic LX battery drain

Put a new alternator in and it's charging I believe I took the negative cable off and it said running but while driving is sputters dies out and then especially when the Sun goes down when it's ...
0 votes
0 answers
184 views

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 ...
0 votes
0 answers
89 views

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 ...
0 votes
1 answer
102 views

2006 Ford F 150 5.4 Triton motor XLT Alternator No Charging

I New Alternator New Fusible link and I still have low voltage battery light in the dash that went away I have read a lot in I Can Find The problem HELP
2 votes
0 answers
78 views

How did you remove a radiator fan in a 2011 Honda Accord? I removed the two screw and harness and it’s supposedly to just slide out but won’t budge

I’m changing out my alternator and gave to remove the radiator fan ti do so. I undid the screws and harness. It wont budge.
0 votes
1 answer
156 views

Can I put a higher/bigger battery for my Suzuki XL7?

I have a 2020 Suzuki XL7 1.5L. It came with a wet-cell battery: Furukawa FB 38B19L (32Ah). I'm about to replacing my battery, and I wonder what type of battery I should consider. I already checked ...
1 vote
0 answers
39 views

New alternator and 2 new batteries but still get bad battery light

Have a dual battery setup in my 2000 gmc Sierra with an auxiliary battery for my sub isolated through a relay to the other for charging had some issues with the lights dimming so I replaced the ...
0 votes
1 answer
70 views

Does this alternator sound ok?

This is a video of me spinning the alternator, via the clutch pulley, that sound recorded very softly, do turn the volume up. And if you notice an issue please let me know https://youtu.be/Hy7hJ07wRYU
3 votes
1 answer
905 views

Have I fried my alternator through frequent use of an external charger?

Recently, on a longer trip, the battery light came on while I was driving, indicating the alternator was no longer charging the battery. The shop diagnosed a bad alternator and replaced it, which ...
4 votes
2 answers
27k views

Welding on car - damage to ECU, battery, alternator?

I had to weld nuts to the outside of rounded-out allen type bolts when removing 15-year-old rear brake calipers and carriers this weekend. As I was laying under the car welding (probably running ...

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