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I measured my car's voltages with a multimeter.
1) Battery voltage w/ car ignition off: 12.55v
2) Battery voltage w/ car engine running: 12.45v
3) Battery voltage w/ car engine running and headlights and ac fan ON: 12.05v
4) Car engine running and voltage output directly at the alternator itself: 12.45v
Is this a sign of a bad alternator and must it be replaced? Or should a bad alternator displace an even lower voltage than 12.45v?
Thanks
The battery needs to be at 12.5 so, you need more to charge it. A good alternator will be charging at 14.5. You need to check at the jumper leads (back passengers side) while running. That voltage need to be more than 12.5 to charge the battery.
I just replaced one that was only charging 10.5 volts.
Note: ZHP’s came with two different alternators.
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What is the jumper leads at the back passenger's side? I have corrected my original post above with clearer descriptions of the car's engine running.Quote:
Originally Posted by 3ZHPGUY
Is that the voltage you get from your car? I get 13.9-14.0 over two alternators according to my radar detector.Quote:
Originally Posted by 3ZHPGUY
YoitsTmac, wow, we need to meet up as I am in the Bay Area now.Quote:
Originally Posted by YoitsTmac
These! You should get 12.5 volts, with the car off and 14.5 volts, with it running at idleQuote:
Originally Posted by cavette
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Shoot me a message on instagram! I normally go to BMW CCA meets in the north bay. You just missed an awesome drive this weekend!Quote:
Originally Posted by cavette