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Battery drains flat quickly

Tiny
RADIOJOHN
  • MEMBER
  • 1991 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
I have an 8.000 ohm resistance between the battery cables when disconnected. Battery drains flat after only a very few days. Tested with all switches off.
Possibilities would be appreciated.
Thanks
Monday, August 28th, 2017 AT 11:52 AM

1 Reply

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Charge the battery up. Take one cable off and connect the cable to one lead on your multi-meter and the battery terminal to your other lead. Turn the multi-meter on to DC 20 (or whatever yours says). There should be some reading there as various things are pulling power (computer memory, radio memory, and anything with a short circuit). With that going, pull a fuse, and check to see if there is a significant drop in the reading. You will know a significant drop when you see it.

If the truck has any aftermarket additions (radio, amp, lighting, security system), then start with those fuses.

This process will point you to whatever area your problem is. So do that, and let us know and we will go from there.
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Monday, August 28th, 2017 AT 2:42 PM

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