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If my battery got hooked up backwards in my car and I replaced everything I needed to and got it running and now alternator isn't charging battery, could it be the plug on alternator? The points?

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  • Cars & Trucks Master
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If you hooked up the battery incorrectly you may have blown a diode in the alternator so have it checked out as it will not charge if it has blown a diode

Posted on Jul 27, 2013

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Posted on Jan 02, 2017

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SOURCE: 1992 Nissan Pathfinder charging problems

How long did the 2nd alt. last before it died? The voltage regulator is, I believe, attached to the alternator. Have u had the voltage regulator checked?

Posted on Jan 04, 2009

  • 3 Answers

SOURCE: 86 nissan 300zx

i got the answer for you! in your engine compartment on the passenger side near the battery is a box that has,what lookes like plugs in it. take out the one on the farthest right(on the cover it says BAT) just relpace it or bypass and you will be set! let me know how it works out Parker217@live.ca

Posted on Mar 21, 2009

  • 37 Answers

SOURCE: my alternator is over charging and damaging my battery

GET ANORHER BATTERY THE BATTREY FOR THOES CARS REQUARIES BIG VOLTS CHEEK AT YOUR AUTO PARTS PLACE THEY CAN TEST IT FOR U FOR FREE GOOD LUCK

Posted on Apr 05, 2009

Molson02536
  • 3854 Answers

SOURCE: Charging light comes on and car dies,

Check the wire harness to the the Alternator for any loose or broken wire. Check the ground to the battery too. Good luck and hope this help's

Posted on Apr 08, 2009

jturcotte
  • 8215 Answers

SOURCE: I have a 2003 kia spectra 1.8 liter. The

Hi, there are 3 fuses the the alternator needs to charge the battery. These may be inside the car or in a box in the engine compartment. They are named IG1, ECU, and ALT. If you have trouble finding them, please get back to me.

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Posted on May 08, 2011

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1 Answer

Hooked up my new battery backwards, blew the main fuse. It has been replaced and now the meter fuse in the inside fuse box blows within seconds and gage cluster and alternator not working


Could have damaged regulator. When the car is running have you checked the voltage at battery terminals. If battery is charging it should be around 14 volts. If around 12 your charging system is fubar.

Meanwhile if you have to charge the car every day then something in the car is draining the battery, Using an ammeter you need to track it down, Hook it up to battery and pull fuse out one at a time till the drain goes down. That isolates the circuit with the problem.

Dec 03, 2015 | Cars & Trucks

1 Answer

Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into...


The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

Jul 26, 2013 | Cars & Trucks

1 Answer

Hooked up battery backwards now engine isn't


No. Replace the Engine control unit that was destroyed when you reversed the polarity to it.

Jul 22, 2013 | Cars & Trucks

1 Answer

I have a 98 Ford Taurus. Somehow water got into alternator and back charged everything. the radio went out i replaced the alternator, the car started right up, but the battery indication light came and it...


Sounds like you fried a circuit or two. The battery light means the alternator is not charging the battery which you know.
The charging circuits will need to be checked, it could be a fuse or a fuseable link which is a wire that acts like a fuse.

Jul 01, 2013 | Cars & Trucks

2 Answers

Battery going dead when truck is not running


If the battery isn't over 4 years old, then you
have to pull one fuse at a time or put an amp
meter in series with either battery cable to see
where the drain is.

Some Module may not be timing out or there is
a problem with the alternator

Every vehicle is wired different ,simply can't give you
a specific cause,has to be tested in the proper way
to stop the problem

Nov 16, 2012 | Ford Cars & Trucks

1 Answer

Alternator over charging


The alternator is vital part of your car or truck's electrical system. When the vehicle is running, the alternator provides a constant charge to the battery, as well as to other accessories. Without the alternator, the battery will eventually discharge. However, if the alternator isn't working correctly, it may send too great of a charge to the battery, which is known as overcharging. This condition is dangerous to your car's battery and electrical system. You can test to see if the alternator is overcharging, using a simple voltmeter. Start your vehicle and open the hood. Be aware of the moving parts within the engine compartment, as you do not want to get your hands or tools anywhere near them.

  • 2 Locate the vehicle's battery. It may be obscured by protective shields, the air filtration or intake system or a fuse box. Whatever the case, you need to remove everything that covers the battery. You must have access to both the negative and positive terminals of the battery.
  • 3 Turn the digital voltmeter on and adjust it to the proper settings, if necessary. The voltmeter must be set to "DC" and 12 volts.
  • 4 Connect the clamps or leads of the voltmeter to the battery. You must connect positive to positive and negative to negative. The positive lead is usually red or yellow, while the positive terminal on the battery will be marked with a plus sign. The negative lead on your voltmeter is black, while the negative battery terminal is marked with a minus sign.
  • 5 Examine the voltmeter. If you've hooked it up properly, you should see a reading somewhere between 13.6 volts and 14.3 volts. A reading higher than 14.4 volts warrants further testing by a professional. If your alternator is found to be overcharging, you will need to have it replaced.
  • Nov 13, 2011 | 1997 Buick LeSabre

    2 Answers

    My car keeps dying out, could it be the battery or alternator?


    unlikely, if it starts the battery is good because it just started the car and the alternator is good because it charged the battery the prior time it was running. i would put some thought into a fuel supply problem, such as the pressure falling off rapidly after a start; or something getting hot in the ignition systrem and failing causing a loss of spark.

    Jul 25, 2011 | 1993 Ford Probe

    1 Answer

    Saturn 98 wont hold charge, batterie light turn on and than car stop running... is it the alternator or the wireing


    Alternator is your likely problem. The wiring isn't bad in saturns, just need to replace the belts when needed. Your problem though is definitely that it just doesn't keep a charge, so your alternator is responsible for your dilemma.

    Jun 23, 2011 | Saturn SL Cars & Trucks

    1 Answer

    I have a 1999 Mercury Sable and accidentally installed the battery backwards. Replaced blow fuses and the car ran fine. After sitting idle for 3 days, returned to find the new battery dead. A jump start...


    Check and make sure your termimals to the battery are clean and tight. You can find out if the alternator is charging by simply starting the car and while it is running take the negitive cable off the battery. If the car quits its not charging (have the alternator check) if the car keeps running it is working properly. If it is charging and all your termimals are tight and clean you may have shorted out the battery and ruined it by hooking it up backwards. Good luck

    Nov 13, 2010 | 2009 Ford Taurus

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