Question about 1984 Oldsmobile Cutlass

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Battery will not charge, first time its ever did this. rebuilt alternator new battery and new starter not to sure if new starter has anything to do with battery chargin but replaced it anyway, has good connection but wont charger any other reason why my battery wont charge?

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  • Master
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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.

Posted on Aug 08, 2010

  • blackrod88 Aug 08, 2010

    i was told my alternator has the built in regulator? but if it doesnt where would it be on a 84 cutlass supreme brougham? so the alternator can still be messed up even if it was rebuilt i just got it back from the shop to be rebuilt? and i got them to double check it and they said it was good.

  • James Young Aug 08, 2010

    It is possible. They may have rebuilt the regulator and only tested it against providing voltage and not amperage. If the regulator is bad it will not recharge the battery fully. It will throw voltage out all day long, that is the easy part. It's like a battery with a dead cell. It has all the voltage in the world but it doesn't have the amperage to turn the starter over. You replaced the battery and basically replaced the alternator, assuming they actually put it together correctly and actually tested it under a load. If this is the case you need to start checking wiring. Normally a new battery comes pre-charged and ready to install. If you installed the new battery and the starter still did not work but it will start with a jump rebuild or replace the starter, check your main wires from the battery making sure you have no breaks in the insulation and good connections on both the battery and where they connect on the vehicle. Recheck the fuses and relays located in the engine compartment. Some of these maybe located on the inside of the fenders under the hood. In most cases with charging problems you have grounded wires that shouldn't be grounded, a bad battery, a faulty alternator or voltage regulator.

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