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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Best way to recharge battery using alternator?

Let's say I'm unable to start my car. I get a jump from another car, and my car is now running and charging the battery. The advice I get next is "leave it running for 45 minutes so it can ...
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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 ...
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What makes the battery light come on

My question is not “why does the red battery light come on”. I know it’s a battery or alternator problem. What I would like to understand is the physical mechanism that makes it turn on. Is it a ...
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96 Olds Cutlass Supreme 3.1L Is it the alternator?

Is it the alternator?? When I put the key in the ignition all my lights come on bright, the icons on my display light up & my radio works BUT when you turn the key car won’t turn over & you ...
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6 votes
2 answers
2k views

Trying to use a car alternator for a power source (not for car)

I’m trying to use a car alternator for 12 V bench power source, got it all going and getting 14.5 V with no load but once I apply a load to it the output drops to 8.5 V. Is it a faulty alternator or ...
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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 ...
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2 votes
2 answers
50 views

Car starts only when I jump it

I have a 2006 Dodge Caravan SXT. Bought it from a friend who said that the battery was replaced like two years ago. Everything was fine until recently I started having this problem where the car would ...
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4 answers
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I shorted the alternator for a second with a multimeter set to measure current

I was debugging a battery. The resting voltage was 10.8, which means either the battery is bad or there is something draining it. So to check the drain I had my multimeter connected to measure ...
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How much electrical power can a van deliver at idle?

Trying to decide (for camping in a van) for power: Solar vs. Generator vs. Alternator How much power could a van (assume a Ford E150 Econoline) deliver with the standard alternator per hour at idle ...
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Is it normal to over flow little battery liquid

I got an overflow issue with my car's old battery and now replaced it with a new one. currently, when I go for a long drive few vapors are released through the overflow exit side of the battery. Is it ...
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Alternator discharging

Hi everyone thanks for your input I have a 1994 Isuzu Rodeo and the alternator goes negative when I rev the engine also when staring the engine it goes to negative and I have to wait until it builds ...
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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 ...
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4 votes
4 answers
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I need to take my motor mount off. I don't have a jack. So can can I take off that mount to get to my alternator pulley without dropping the motor?

I have a 2006 Chevy Malibu 2.2 Ecotech. I can't loosen that pulley unless I take off that motor mount that's in the way.I don't have a jack so. Can I successfully remove the motor mount then put on ...
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2 votes
2 answers
131 views

Is it OK to run a new wire directly from the alternator to the battery?

The battery is not charging, and when I use an ohms meter between the alternator output terminal and the battery +, I read 7.5 ohms. When the motor is running I see 14.45v between the alternator ...
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Rewiring old british standard termination connector on my alternator (Lukas 15ACR)

I have an old Lukas 15acr alternator on my diesel engine and I need to change the wiring to the regulator. The plug seems to be called british standard termination (the three pins are aligned in a ...
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Alternator / Regulator / Battery issue with Yamaha XJ 600

I don't use my XJ 600 so often and a few months ago, it wouldn't start due to an empty battery. The battery was old. I got a new one, and a SC10 "smart" charger to take good care of it. Two ...
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0 answers
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2003 Ford Escape charging issue

So I’ve had alternator issues in the past in my 2003 Ford Escape. Just the other day my battery light came on, I took out the alternator and the battery and my alternator failed a bench test, so I ...
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2002 Ford Escape Alternator Removal. Haynes says you can just remove it from the bottom but I know you cant?

I've taken out the alternator on this car twice. Both times I tied a rope to it and pulled it out from the top (damaging the wiring harness and probably some other stuff in the process). A mechanic ...
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17 votes
3 answers
5k views

Car battery at 10v, then shows 14,5v while car running after boost, then when car turns off, drops to 10v again within a minute

Yesterday car suddenly didn't start. We boosted it and drove for an hour. When parked, it would restart immediately. But after waiting 1 minute, it wouldn't start again. Today I measured the battery: ...
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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, ...
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2 answers
112 views

2008 Honda Civic turned over slowly but didn't start on first attempts, now dead even when attempting to jump

My 2008 Honda Civic has been turning over slowly, but failing to start on the first couple attempts to start it lately. Sometimes it'll start first try, but typically it needs multiple attempts. My ...
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1 vote
1 answer
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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 ...
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3 answers
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Brand new battery sitting for 3 months, doesn't hold charge anymore

I have a 2017 Toyota Yaris Hatchback. The car had some cranking issues. I did a cranking voltage drop test (dropping to min 7v when cracking), it seemed like the battery was done. I replaced the ...
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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 ...
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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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2 answers
84 views

Exernal diode as alternator hotfix?

I have an alternator that likely bad diodes - erratic output, drains the battery when off, etc. Automated in-vehicle test at an auto parts shop also reported bad diode as the problem. Since it does ...
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0 votes
1 answer
32 views

Ford Ka - blowing hot air after new alternator was fitted

Hi I have had a new alternator fitted today, I have had the car back and drove it and turned on the cold air in my car and its just blowing out hot air, I never had this issue before the new ...
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What happens if the main battery gets connected backwards?

2008 Mitsubishi Nativa (Pajero?) now no power coming from alternator after my experienced mechanic hooked up the car's battery backwards. He saw the spark he said but didn't register as he was ...
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3 votes
2 answers
613 views

Charging LiFePO4 with car alternator

I currently have this setup in my van: Alternator -> Car Battery -> Voltage Sensitive Relay -> Leisure Battery (AGM) I'm thinking of changing out my AGM battery with a LiFePO4 battery instead,...
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1 answer
66 views

How much electric power does my truck consume?

I have a 2011 Nissan Frontier Pro-4x. I want to get a general idea how much power I could draw from my alternator while driving. For that, I want to find out how much power my truck uses in the first ...
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1 vote
1 answer
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Can a faulty alternator trigger the Check Engine light?

I have a 2010 Toyota Corolla S. Couple of weeks ago while driving my battery light came on. I replace my alternator after that. That battery came on again after 2/3 days. I took my car to a different ...
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0 answers
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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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1 vote
2 answers
101 views

Most Dash Lights (and Gauges) Turn on and off Periodically before Car Shuts Off Completely

Alright, I'll try to keep it snappy. 2005 Chevy Express 3500 4.8L V8. 130k miles. Most dash lights would turn on and gauges would go dead for a couple moments and then come back periodically. It's not ...
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0 answers
68 views

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 ...
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1 answer
54 views

Troubleshooting of Battery vs Alternator

it's been a while! Hope everyone is well. This might be kind of a dumb question but here we go: My car's battery light turned on a few days ago, then suddenly went off one day when I rode the car to a ...
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1 answer
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What does the 'battery' light on the dashboard actually mean?

I know that when the battery symbol lights up on the dashboard it indicates a problem with the electrical system, which is commonly either an ageing battery or a broken alternator, but for the ...
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1 answer
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Where do I stand on a misdiagnosis when I've already paid for the repair and driven the car home? [closed]

last week I couldn't get my car to start I had it towed to a national known Auto repair chain they had it for five days couldn't figure it out. so I had a towed to another shop when I called and the ...
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1 vote
1 answer
63 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 ...
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0 votes
1 answer
56 views

Mercedes-Benz battery charge warning light

I have a Mercedes-Benz model 2004 with V-6 petrol engine E320. On the dash-board a battery mark you can watch always unless you push the botton on steering wheel will disappear. And battery still ok , ...
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1 answer
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Lexus IS250 2008 won't start

Today, I tried to sell my Lexus IS250 2008. I turned the car on and drove to meet the guy. When I got there I let car on idling because I wanted it to warm up (heating was on, seat heating was on, etc....
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5 votes
2 answers
205 views

Can a defective starter stop my car?

Just before christmas my car died while my girlfriend was on her way to work. She told me that when the car stopped it went completely silent (no engine/lights/music). Since she drove for about 15km (...
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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 ...
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1 vote
1 answer
57 views

Alternator whining problem

Hi my alternator produced this whining sound but its charging at 2,500 rpm with 13.1 volts with Aircon how long will this last before i replace it with a new one? The problem now is am at the trails ...
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0 votes
1 answer
60 views

Help needed with electrical setup for overlanding

I am converting my 2011 Nissan Frontier Pro-4x to an overland-ready setup. For this, I want to set up a separate electrical system to power certain items. I need some help calculating the requirements ...
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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
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2 votes
1 answer
401 views

Car refuses to start with repeated clicking but can be jumped

Day 1: My 2013 Infiniti JX35 won't start. When I press the ignition button, the car loses all electrical power and I can hear repeated clicks under the hood. I installed a new battery, and it started ...
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1 answer
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How to diagnose if battery is faulty or alternator is faulty

Little Background: I own 2016 Mazda CX-5, battery that came with car was not holding the charge for long, so after some research on which battery to replace it with, I decided to replace it with ...
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0 votes
3 answers
169 views

Bad alternator, or just a regular dying battery?

The battery in my car is dead, and I'm not sure whether it's the alternator's fault or just the natural death of an old battery. Vehicle: '04 Honda Accord. The alternator was replaced 4 years ago. As ...
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2 votes
2 answers
152 views

What is the Likelihood of a car alternator fault being due to worn field winding brushes? [closed]

TL;DR: If a 2001 Toyota Corolla alternator is faulty, how likely it is that the field winding brushes have gone open circuit? It's reasonably likely that the alternator is the original one.  ...
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