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2001 Mercedes Benz C320 drained battery

Tiny
OLEHUNTERBOY222
  • MEMBER
  • 2001 MERCEDES BENZ C320
Electrical problem
2001 Mercedes Benz C320 6 cyl Two Wheel Drive Automatic

car always started in warn weather, now that it is cold it is dead after setting all night. Battery tested 95% life left at napa alt tested good. Was told to place a test light between either battery post and cable. If light is on start pulling fuses. Well I pulled fuses in all three fuse locations in the car. Also disconnected pwr seat modules. Still no luck. Need help on diagnosis technique. What I am doing would seem to keep light on anyway. Unless the circut is not completed until key on. Set DMM to Ma and no draw found. Please help
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Monday, December 8th, 2008 AT 8:12 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

You need to do that test with an Amp meter, and also disconnect the alternator as it may have a faulty diode that ids back feeding, this will not bother the charge rate to any great degree.

Mark (mhpautos)
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Monday, December 8th, 2008 AT 11:24 PM

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