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re: How much voltage drop overnight is OK in a car?
Posted on 11/30/22 at 9:58 am to Boudreaux35
Posted on 11/30/22 at 9:58 am to Boudreaux35
quote:
Your battery is failing; probably a bad cell or a faulty alternator.
I just put a brand new battery in a little over a month ago.
quote:
Is this local
It's in Arizona, definitely not cold.
2
Posted on 11/30/22 at 10:08 am to Ajo Devil
quote:
a faulty alternator.
A quick check for a faulty diode inside the alternator, start the car, and with a multimeter and the AC scale selected (not DC) check for voltage across the battery terminals. Should read 0.00
Any voltage read is a voltage leak through the diode and will cause a parasitic drain on your battery when shut off.
Posted on 11/30/22 at 10:45 am to Ajo Devil
quote:
I just put a brand new battery in a little over a month ago.
Doesn't mean it isn't faulty. I went thru 3 batteries last spring that would not hold a charge. The guy at the store got pissed at me and swore it was not the battery. So he put it on their charger. After 2 hours it still would hold a charge. He gave me my refund because I was tired going back. Went down the street and bought one from a different store and everything has been fine.
If you tested it running and got 14+ then the alt is PROBABLY not the issue.
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