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Drained new battery

Tiny
MSAKOWSKI
  • MEMBER
  • 1971 CHEVROLET CORVETTE
  • V8
  • FWD
  • AUTOMATIC
  • 100 MILES
I just purchased a 71 454 corvette at mecum in fla and it had a dead battery. I replaced it and it ran fine. One week later and it's completely dead again. Why? I'm not a expert mechanic.
Sunday, February 20th, 2011 AT 9:56 PM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Test alternator voltage at battery while car is running. Should be 13.5-14.X volts. Even if it charges, there may be drain thru alternator while car sits. Rare, but it does happen.
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Sunday, February 20th, 2011 AT 10:02 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
If that car has an external voltage regulator the drain could be from that.
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Sunday, February 20th, 2011 AT 10:04 PM

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