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My alternator is not charging my battery - Ac Delco Vehicle Parts & Accessories

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Would need more info to narrow it down year, make, etc. but usually will be a loose fan belt, a bad battery, bad regulator,or burnt brushes in the alerrnator. Most jobbers can bench test your alternator for you, and your battery as well which will get you of to a good start

Posted on Nov 26, 2014

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3 Answers

Why would the alternator test good off the truck but not charge


check the wiring on the vehicle to and from the alternator. Usually, the alternator needs excite voltage or it won't charge. Also, There is a circuit from alternator to battery, if something wrong with that circuit, the battery won't be charged even though the alternator is working fine.

What is model year? I don't know if your alternator is computer controlled?

Jul 11, 2015 | Ford F-150 Cars & Trucks

1 Answer

Alternator not charging


If the alternators are not exactly the same as the original then there may be a problem with the voltage regulator circuit. Some alternators have internal regulators and others have external regulators.. Check for fuses in the charge circuit . If the battery is faulty then the alternators will not charge any way. Have a load test done on the battery.. If ok check the wiring circuit as the alternators require battery voltage before they will charge (no residual magnetism in an alternator)

Jan 12, 2014 | Cars & Trucks

1 Answer

I have a new battery and new alternator on my 1998-A4-1.8. The alternator will not charge the battery


Check for fuse and or give it a direct ground from the battery terminal and see what happens it should charge 14+V

Mar 11, 2012 | 1998 Audi A4

1 Answer

My battery dies i replaced a brand new alternator but still dosen't charge tomthe battery


The battery most likely has dead cells and not charging due to the alternator .The alternator is doing what it should, your battery just can't hold the charge the alternator is putting out. Go have the battery tested at a local auto zone or advance auto store. Free to check

Dec 15, 2011 | 1995 Ford Windstar

3 Answers

Battery light comes on and off car dies with a quick boost it run again then dies battery good


this is caused by a failing alternator. Kragen auto and Autozone tests these for free.

Jun 03, 2010 | 1996 Mercury Sable

1 Answer

Alternator not charging the gage saying not charging but charging 9 volts had alternator tested its charging 14-15 voltes its got a new battery not charging good enough


ALTERNATOR DRIVE BELT SLIPPING OR BATTERY CABLES NEED REPLACING IF THEY ARE THE ORIGINAL ONES.THE VOLT GAUGE COULD BE FAULTY.TO TELL GET A DIGITAL VOLTMETER HOOK TO CAR BATTERY CRANK CAR UP.BATTERY VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS. WITH NEW CABLES. IF NOT CHECK ALTERNATOR FIELD WIRES FOR DAMAGE ALSO ALTERNATOR POSITIVE WIRE FOR DAMAGE.

May 30, 2010 | 1994 GMC Safari

4 Answers

Dash says battery not charging


Alternator is what charges the battery. The alternator isn't putting out enough of amps to charge your battery and you will get a light or gauge reading that the voltage is low.

May 11, 2010 | 1998 Cadillac DeVille

1 Answer

325ci wouldn't turn on so I got a jump and then when I turn it of


A working alternator can try to charge a bad battery but won't. Have the battery and charging system checked with a machine. Also note: your alternator is not designed to charge a battery. It is made to maintain the state of charge present in the battery. If the battery has been drained, then jumped, the alternator can put a surface charge there but will never fully charge the battery...This is only done with an external battery charger. Not doing this will over-work the alternator and shorten battery life!

Jul 30, 2009 | 2003 BMW 325

1 Answer

Charging problem.. Wont charge battery


The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!

May 02, 2009 | Honda Accord Cars & Trucks

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