1999 Volkswagen Jetta Battery drains over night

Tiny
CMINYON05
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I've replaced the alternator, the battery, and put in alll of the correct fuses. Nothing stays on in the car, and if there is a short, I can't find it. I've been having my cousin, who is an experienced mechanic, try to fix it for over 2 months now. The car has him so confused. Any help would be great.

Christina
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Tuesday, March 10th, 2009 AT 7:53 AM

3 Replies

Tiny
MMPRINCE4000
  • EXPERT
Hook up a multimeter to battery in most sensitive DC volt mode (.01V).

Remove fuses one at a time until you find the culprit circuit.

Then disconnect each item on that circuit one at a time (radio for example) until drain disappears on multimeter.

If draining overnight, it would be a large drain, 1-2V.
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Tuesday, March 10th, 2009 AT 8:31 AM
Tiny
CMINYON05
  • MEMBER
Should I do this while the car is running? We already tested all of the fuses while it is off, and we still can't find it. Any other suggestions?
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Tuesday, March 10th, 2009 AT 8:47 AM
Tiny
MMPRINCE4000
  • EXPERT
No, car should be off, ign. Off, otherwise the alt. Charging the battery will not allow you to find the drain.
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Tuesday, March 10th, 2009 AT 9:56 PM

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