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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62 views

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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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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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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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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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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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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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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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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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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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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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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Car Battery Charging Current & Car Battery Confusion

Confusion Regarding Car Battery and Charging Amps What is charging current in Car Battery : If both the battery’s have Ref Capacity - 68, But 1st Battery has a Charging current of 4A and the 2nd ...
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269 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 ...
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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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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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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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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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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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62 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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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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166 views

Can car alternator be used to save fuel by using it as a regenerative system at the same time?

Car alternators are 3 phase DC excited synchronous electric machines. They can be used as a motor by a proper 3 phase motor driver. Let's think that we connected a 200Ah Lithium based (eg. LiFePO4) ...
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97 views

Access to alternator output for powering a custom device

I have a custom made circuit (device) to be installed in my vehicle. This device is to work (power up) only when the engine has started. It consumes a reasonable amount of power hence do not want it ...
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Car won't start after sitting for 2 years even with a jump. Is it a starter or alternator issue?

My parents have a 2001 Pontiac Aztek that's been sitting for two years. Apparently, before they stopped using it, there was an oil leak that caused starter problems (they couldn't find the leak), and ...
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700 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 ...
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New ish battery, new alternator, battery light stays on (dim)

Battery was replaced 7-8 months ago (Interstate batteries brand) Got new alternator today after car died When picked up, battery light was faintly glowing Mechanic said everything was fine and it's ...
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Car battery voltage always drops even after full charge

I bought a new 2019 Kia Forte last year, from the day I received it, its battery (lead-acid AGM) read a slightly low open voltage of around 12.45V. I figured out the car must have been driven on the ...
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Alternator health check

My car (Fiat Grande Punto MY2008) has been having an occassional battery light and failure of the power steering. Perhaps once in every 10-15 startups, and is resolved by restarting the car. The car ...
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Jump start car - now alternator fail

What are the tell tale signs of connecting a jumper cables the wrong way. Will other sensors blow first? If there is a voltage difference between cars could the alternator blow. I helped jump ...
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Any benefits of a relay over a dead mans switch between two 12V batteries apart from preventing discharge of starter while car is off?

I am fitting a second "leisure" battery in my car. It will be a 12V 115-150Ah AGM lead acid battery for use when the engine isn't running with loads up to 500W, generously, in practice It will be 250W ...
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What is the Problem

I have a 2004 Chevy Trailblazer EXT. I was driving down the road and my battery light came on. I didn’t know what it meant but I kept driving. Then my lights became dim and I pulled over and parked at ...
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Odd noise from top of engine

I'm helping a friend with their car. Its a 2014 Mazda 2, 1.5L engine, approx 105K miles. The car has been well maintained with regular oil changes. There is an odd noise coming from the top of the ...
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277 views

Charging Battery Pack with alternator

I'm thinking of making a car battery with 3.7 V Li-Ion batteries arranged in 4s configuration (14.8 V). Would an alternator that produces 13-14 Vdc be able to charge the battery pack at all? Thanks
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Toyota Matrix 2012 – Can I assume a running alternator must supply perfect electricity even if the battery is dead?

I have a 2012 Toyota Matrix. It is very similar to Corolla. The car struggles to start, and my first guess is to simply replace the battery. However, when the car starts (means car alternator ...
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274 views

voltage starts at 14 every morning but then drops below 12 shortly after driving

Just bought a 1998 Nissan Frontier. It has a new alternator. For a while I was getting shorts at the terminal connectors so I replaced both. That seemed to fix the short but then I started having ...
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73 views

Help diagnosing start up/battery drain problem

Ii previously asked this question New batteries keep getting drained, any ideas of cause? Sorry was not sure how to link question. Anyway I got a multimeter and here are my findings. Firstly the ...
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74 views

Alternator intermittently outputs 12.6V

I have a 2005 accord and have recently had the alternator and the battery replaced from the honda dealer. I then install the voltage meter on the cigarette lighter port. I notice the voltage output is ...

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