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Battery good, alternator good, starter good but my 1966 oldsmobile the alternator isn't charging the battery

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  • Cars & Trucks Master
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Have you replaced the voltage regulator?
Unless you have changed the charging system and eliminated it, the alternator does not have a built-in voltage regulator like the newer ones do.
Be blessed.

Posted on Feb 06, 2013

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Posted on Jan 02, 2017

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SOURCE: I HAVE A 1995 ISUZU

Could be one of two things.

1. Your starter motor is no good.
2. If you turn on your lights and try to start the car and they dim to almost black, then you need to check the battery connections.

Posted on Jan 03, 2009

  • 91 Answers

SOURCE: Here we go. Battery is dieing, had the battery

RAP stands for Retained Accessory Power. It is the circuit responsible for powering accessories when the key is off. Sounds like something is staying on that shouldn't. Hard to say what though with the information here. if this started happening right after you put in the new radio i would check into that. otherwise start checking accessories like power mirrors,seats, locks and see it something is staying on that shouldnt. i good one to check would be the glove box light or the light under the hood. you can unplug them and then test your draw to see if thats where is was.

Posted on Mar 28, 2009

  • 6982 Answers

SOURCE: good batt & new alternator.. but battery keeps losing charge

Make sure all connections at alternator are attached. On some, the regulator is inside the computer and if bad, requires computer change.

Posted on Jun 26, 2009

  • 117 Answers

SOURCE: Alternator & battery test good...alternator is not charging bat.

you might check the fuses and battery cables

Posted on Jul 03, 2009

  • 60 Answers

SOURCE: Battery not charging

I would check the altenator again. if you didnt disconnect the battery and a spark shot off while installing the new starter it could have decharged the spool on the inside of the altenator to where the spool no longer charges. if you have the altenator checked for consistant charging and it comes up good check the relay for the altenator it most like will have messed up the relay. to make a long solution short check the relay for the altenator it will be in the relay box under the hood.

Posted on Jul 08, 2009

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I replaced the Alternator on my 1986 Oldsmobile Cutlass Ciera and The battery is not holding a charge. What could be causing this?


Providing there is no trunk light, or glove box light or anything else that is staying on, the biggest culpret for draining batteries is the starter. Try replacing it with one from an auto wrecker, just in case it isn't the problem.
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it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

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A bad voltage regulator could cause the problem. Assuming the alternator is working correctly. Jump the vehicle with the battery disconnected and then disconnect the jumper cables. If the vehicle dies your voltage regulator or Alternator are bad, some vehicle have separate regulators from the alternator, if it continues to run the alternator is good but the voltage regulator is probably the cause.

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1 Answer

1983 Oldsmobile Delta 88 Electrical problem. I AM STUMPED


It goes thru the dash circuits. Yes! add a wire from the alternator output to the plus battery . The charge lite may be inoperative - either on or off. You might want to put a fuse in that new line.
A cheap volt-ohm-meter would help you see if the alternator is charging 14-14.8 volt and the alterantor field is being energized.

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