2000 Mercury Mountaineer battery

Tiny
805SUPERNOVA
  • MEMBER
  • 2000 MERCURY MOUNTAINEER
  • V8
  • 4WD
  • AUTOMATIC
  • 172,000 MILES
Weve had battery checked and they said it was fine, but every morning for the last few days we need to jump it. It turns on and off with no problems through out the day but then it needs to be jumped again the next day. What do you think it might be?
Saturday, December 15th, 2007 AT 1:34 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
A parasitic drain, check this way: Get an analog voltmeterremove the negative battery cable, attach the red lead to the battery post, black lead to cable end, then pull fuses one at a time, make sure there are no accessories or lights in the on position, Key off! Close the door after each fuse and check meter, when you pull the fuse for the bad curcuit, the meter will drop to 1 volt or so. Check all fuses, even under the hood. If meter does not drop, remove the battery connection from the alternator, if it drops now, the diodes are bad in the alternator.
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Saturday, December 15th, 2007 AT 1:39 PM

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