Question about 1992 Pontiac LeMans

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Alternator OK / Car not charging

Recently rebuilt alternator and had tested to be good / will not charge while on car

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  • Anonymous Mar 21, 2014

    good alternator good battery but will not charge

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  • Master
  • 702 Answers

Check the trigger/exciter wire on the back of the alternator to see if it's broken.

Posted on Jun 10, 2008

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8 Answers

The alternator is not charging the battery on my 2002 Alero, how do I fix this?


a bad battery would give a wrong judgement of an alternator output. take off your battery and replace with a working one, test your alternator output using a DMM it should read about 12.5 when engine off and 14v when engine start running any figure more or less shows you have a bad alternator or an incorrect input current to the alternator....hope this fixxx it?

Jul 14, 2015 | 2002 Oldsmobile Alero

1 Answer

I recently had my starter rebuilt, my alternator checked, new battery put in. All working good but, my battery wont hold a charge. Something is draining my battery. After a hour or so after running it will...


Two possibilities.

First, if the belt running to the alternator isn't tight enough it will slip and won't charge properly. You can check the specs for your specific car but generally when you press halfway on the belt span you shouldn't be able to push in more than about 3/8"

The second guess would be that the alternator is, in fact, faulty in spite of being checked. If the battery is dead after an hour of the car running the alternator isn't putting out anything at all to charge the battery.

I'd try having the electrical system tested at another place. Autozone and Advance Auto will put on a tester for free. The dealer of the car will help too but will be the most expensive.

Good luck.

Mar 08, 2015 | Cars & Trucks

2 Answers

Gone thru 3 alternaters in 5 months whats up


If the alternator passes the bench test but is not charging on the truck, you have a problem in the wiring between the alternator and the battery, or the alternator and the key switch.

Dec 10, 2012 | 2003 Cadillac Escalade

1 Answer

Alternator has been replaced a year ago on my 2003 honda civic & belts as well as a new battery but the battery light keeps coming on. had my battery & alternator checked & came up good, what...


Checked on the car,recently,and by a repair shop--
because they obviously failed to find your issues &
correct


Alternators are used rebuilt parts,so who knows


Back to some shop & have the issue resolved
We can't guess at several items that cause such
a problem


You need a wiring diagram of the charging system
& then go about testing & resolving


We are either never told the entire story here or repair
shops are not given the chance to fix anything, as the
car owner leaves, if their is an money involved ??!!

Nov 20, 2012 | Honda Cars & Trucks

1 Answer

Hello. My 1993 Mercury Grand Marquis died on the highway after the battery "alternator?" light coming on about 20 minutes prior. We replaced the alternator with a rebuilt and the light is STILL...


A ford needs a fully charged battery to work the alternator. You may burn out the replacement alternator by hooking it up to a dead battery. Get the battery charged and have it load tested. You may have a bad battery and it should be checked. http://www.cardone.com/english/club/select/electrical/protech/tech_bulletins/PT37-0006.pdf

May 21, 2011 | Ford Crown Victoria Cars & Trucks

1 Answer

Changing the alternator on my truck do u hav detailed instructions


First disconnect battery, next remove serpentine belt, then unhook wiring to alternator, unbolt and replace with new/rebuilt alternator. Reverse steps and you should be good to go. You can have your old alternator bench tested (tested off vehicle) at almost any autoparts store for free to determine that alternator is bad/not charging. I test everything I drive and work on and advise others not to speculate.

Jan 07, 2011 | 1996 Chevrolet S-10 Pickup

1 Answer

Charge light was on and alternator was overcharging. had alt. rebuilt and new voltage reguator, not charging now. only getting 2 to 3 volts are the charge fuse beside battery. new voltage reg is electronic...


There is a fuse under the dash that is the same one that operates the fuel gauge, if it blows the alternator wont charge. If the fuses are good I would take the alternator off and get it tested. Hopefully the rebuilder will warranty it. I would also make sure the new regulator is compatible with the old type regulator system. Most large auto parts stores can test alternators, and they normally do it free.

Dec 18, 2010 | 1984 Toyota Pickup Deluxe

1 Answer

1996 aerostar charging problem.Replaced alt with a rebuilt one but still won't charge properly,gauge is showing a loss or discharge.Tested rebuilt alt and it is good,installed a used alt from wreckers and...


I recently went through a battery/charging episode. Not to sound like the wise-guy, But! try a good battery and see what kind of reading(s) you can get.
Let me know if this is of help to you.

Sep 07, 2010 | 1996 Ford Aerostar Extended

3 Answers

Changed altenator and it wont charge the battery we changed cables battery tested good just not getting charge back to the battery


You may have a new alternator that was built or rebuilt incorrectly. Take it back & have them test it at the suppliers. Good luck!

Aug 08, 2010 | 1999 Ford Taurus

1 Answer

1994 grand cherokee ltd. charging problem


Yes that little thing on the alt is the regulator. It tells the alt when to charge and when not to and yes its pcm controlled. You can bypass the pcm but I would not reccomend it. I would say alt is probably bad...Cause that pcm wire dosnt usually cause any issues. Youu can have the alt tested at autozone. They can test it in the car or out although out of the car is a much more thurough test. I would again say al is bad....rebuilt stuff is usually rebuilt with good parts from old units meaning most all the parts are used...

Jul 22, 2008 | 1994 Jeep Grand Cherokee

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