Question about 1992 Volkswagen Jetta

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Powerless with a brand new battery. After it sat for five days, I had no power at all ( it was plugged into the block heater). My mechanic can't find anything wrong with the altenator, belt or battery conections. I have no a.c, with only a radio. He says that my battery could have drained from the radio's memory power (it was not on). I've never had any problem in the past and the previoud battery was ten years old. Does anyone have any ideas on what else could be the problem. Grounds are good and no wiring has been change lately. Please and thank you

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Your mechanic is an idiot. Seriously, find someone else. Ask friends and co-workers who that would recommend.
The radio memory surely will NOT drain the battery in just 5 days.

You need to get at very least a volt meter. Measure the battery with the car and all accessories OFF. Should be 12-13 volts.

Start the car and measure with the car running. Should be 13-15 volts. If this checks out, you more than likely have a drain.

Next you need to get a DC ammeter that's pretty sensative. Disconnect the negative cable. With everything off and doors closed connect the ammeter between the battery and the negative cable. If the draw shows more than 25-50 milliamps you have an excessive draw. Pull fuses one at a time and see what the drop is each time you pull one. When you find what fuse shows the biggest drop when removed, see what is powered in that circuit so you know what components to go after

Posted on Feb 04, 2010

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