12 Volt direct drain electrical problem

Tiny
PETER BAGDON
  • MEMBER
  • 1983 CADILLAC SEVILLE
  • 4.1L
  • 40 MILES
Can you try to help solve a 12v direct drain electrical problem? I just got this car it was was sitting over 30 years. Previous owner put a fuel pump and tank in it. He couldn't get it running. I believe he seriously overcharged it. The new battery he bought went bad. The alternator diodes were shorted. After repairing the alternator I still have a 12v drain. The ignition switch or starter isn't shorted. If I unplug the ignition switch it goes away. There's a wire that's hot after I plug in the switch that goes to a grey? Junction box? About at the top of the dashboard looking from below. Any ideas what that is? I know Cadillac was the testing grounds for new things. I have never seen this and it has weird pronglike plugs.
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Wednesday, April 21st, 2021 AT 2:19 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

The battery drains from current flow or amps, not voltage. You will always show voltage but you need to measure the current.

I attached a guide for you to follow for checking the drain correctly. The normal draw is 50-75 milliamps.

https://www.2carpros.com/articles/car-battery-dead-overnight

Roy
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Wednesday, April 21st, 2021 AT 3:57 PM

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