Battery drain/ charging issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72 Super** · 07-31-2021, 03:22 PM

Okay electrical is not my forte Lol. Here it goes. I have a 72 I picked up awhile back and it has a battery drain going on. When I first bought I thought the battery was old and on the small side (550 cranking amps)
I purchased a new AC Delco 800 CCA battery. I still had the same issue.

With my volt meter I am getting 13.6 volts with the truck running. The truck has a one wire alternator. I noticed the harness is still plugged into original external voltage regulator. Should it be? Are the one wire alternators all internally regulated?

With my volt meter set on 10A I am getting a .009 reading. I disconnected the power wire from the alt and no change.

Thanks for any advice here,
Ray

07-31-2021, 03:22 PM	#1
72 Super Senior Member Join Date: Jul 2001 Location: Hyattsville, Maryland Posts: 3,678	Battery drain/ charging issues Okay electrical is not my forte Lol. Here it goes. I have a 72 I picked up awhile back and it has a battery drain going on. When I first bought I thought the battery was old and on the small side (550 cranking amps) I purchased a new AC Delco 800 CCA battery. I still had the same issue. With my volt meter I am getting 13.6 volts with the truck running. The truck has a one wire alternator. I noticed the harness is still plugged into original external voltage regulator. Should it be? Are the one wire alternators all internally regulated? With my volt meter set on 10A I am getting a .009 reading. I disconnected the power wire from the alt and no change. Thanks for any advice here, Ray __________________ 72 Cheyenne Super (Purchased new by my parents in August of 71) Black and White



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