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Mysterious Electrical Drain 850 1997

Hello all-

Wife's car 100k, nicely maintained. Three weeks ago, she calls: "Car's dead". Rush home, jump car, give her my 850, drive hers to drop off the kid and then on to work. Started fine at daycare. Sat from 9AM to 5PM - started fine in the parking lot. Got home - cleaned corrosion off ground terminal. Assumed that was the issue & all is good.

Next day: Get another call from the wife: "Car's dead again". Crap. She calls AAA and they jump it off. She drives to Pep Boys and they test alternator (say it's OK) and install new battery. This was Thursday. Drove the car through the weekend, parked it on Sunday evening. Monday morning: You guessed it - Dead again.

I have done all the looking around I can do. I did my own alternator test under load/no load with a simple digital voltmeter. I tried to use that as an ammeter in series with the battery while pulling fuses to see if I could find the circuit with the drain, but I couldn't get my ammeter to function where that would work out.

The interior light overhead console has been shot (mechanical failure of button) for a few months now and I just bought a used one on eBay, but I don't think that's causing the problem. No lights (glovebox, interior, etc.) seem to be on after checking at night where I could see better.

Any help would be GREATLY appreciate before I swallow my pride and take it to a local independent (I do all my own work and don't even have a mechanic).

Thanks to all in advance!

bobgrice








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    Mysterious Electrical Drain 850 1997

    Check the trunk light by pulling the rear seat pass through down when the trunk is closed. Mercury swithch is probably bad. Your not the first.








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    Mysterious Electrical Drain 850 1997

    open all doors. trip door latch with screw driver to simulate door closing. check to make sure courtesy lites on bottom of door under the latch are indeed going out with door latch tripped. Found two of mine in '96 850 to be defective and lites were remaing on.








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    Mysterious Electrical Drain 850 1997

    Bob,
    Can't help until you get your ammeter fixed so you can isolate the current drain. Usually when using a VOM you need to change the input wire to a fused connection (designed to protect the meter from overload). Did you do that? Is the fuse blown? Typically the VOM's are only good for 2000ma, so if your leakage is over that you will blow the fuse. Once you are able to relaibly measure the leakage current you will be able to isolate it by pulling fuses.
    Good luck
    --
    Tom 69-1800S, 72-1800ES, 96-850T,2000-S70 GLT-SE







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