battery drain

1972 OLDSMOBILE CUTLASS
90,000 MILES • 7.5L • V8 • RWD • AUTOMATIC
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C_CLARK2255
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  • 1 POST
after trying three new batteries the battery still is draining over night. the alternator tested good. also, the ground battery cable has a charge going to it so when i hold the test light onto it the test light lights up. how can i fix this drain? what do i look for?
Oct 6, 2016 at 9:24 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
you need to do a parasitic draw test to see what is doing it. start with glove box/trunk/hood lights first . as those were the big ones that caused it on the earlier models. this article may help.

https://www.2carpros.com/articles/car-battery-dead-overnight
Oct 6, 2016 at 12:10 PM
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