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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44 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, ...
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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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30 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 ...
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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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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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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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265 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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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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45 views

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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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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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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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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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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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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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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47 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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36 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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76 views

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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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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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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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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48 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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267 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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118 views

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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139 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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135 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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What's happening with my alternator?

So, my car has blown up to 6 alternators thus far. Luckily I had a life time warranty replacement on it and did not have to pay for it. Autozone is definitely going to void that warranty on my next ...
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621 views

Schematic for Ford IASF Regulator

Where can I find the internal schematic for the common Ford external alternator regulator, the one with I A S F terminals? I believe these type regulators were very common in the '80s. And also the ...
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164 views

Jeep won’t start after new alternator

I put in a new alternator in my 94 Jeep Cherokee and charged the battery and now it won’t start. It used to start when we jumped it on the old alternator, but now when I turn the key all I get are my ...
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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 ...
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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 ...
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101 views

Alternator output power relationship

Overview: I am currently working on a project that requires a 24v alternator, which is powered by a mower engine. This engine in particular runs around 3,000 rpm, give or take, and does not exceed 3,...
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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 ...
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Alternator squeal

98 rav4. I have a bad squeal, however I tried a new alternator and it did not go away. The charging voltage does not go above 12.3 and when I unplug the plug on the back of the alternator the ...
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755 views

12V AGM battery charging voltage

I have the following 12V car battery: Varta Silver Dynamic AGM 595901085 (12V/95Ah/850A), and the following car: Jaguar S-Type 2.7D. In the technical cars manual it says this: So in cold winter ...
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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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180 views

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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Alternator: amperage when charging a car battery (and time to charge)?

What is the amperage of a typical car alternator when charging the car battery, and how long would the alternator take to charge it (let's take a 60Ah battery as an example)? I have seen multiple ...
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174 views

How is alternator directly connected to vehicle electronics?

I've tried a lot of research but I can't find specifically what I'm looking for no one has actually mentioned this and I've looked at various wiring diagrams which still don't prove how this is ...
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58 views

Diagnosing alternator or starter on a 16 Chevy Cruze LT

how do you know if it's the battery starter or alternator in a 2016 chevy cruze lt when i started the car it sounded like it wasn't going to start also not sure if it's related but i had to get a jump ...
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74 views

Bad alternators?

My elderly neighbor has a 1998 Expedition with an alternator problem as all of the units I've installed and tested output less than 12v. He wants to save some money and purchases used alternators ...
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103 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 ...
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Electrical failure [duplicate]

While fitting a new battery for the old one I erred by placing leads in the reverse order, when I corrected my mistake I found when i try to start the car all switch off for a couple of minutes, when ...
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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 ...
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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 ...

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