Question about 1987 Mercedes-Benz Mercedes Benz 190 Class

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Car batterys cant all be faulty?

My car wouldnt start - only had the battery on for a year. Repair guy came out and fitted a brand new one - 5 days later car wouldnt start again, battery drained (BMW 3 series 1995) Took it into an auto electrician who said the battery was faulty and couldnt find a fault with the car (ie alternator etc). I contacted battery supplier who says will fit another new battery but he is convinced the problem is with the car - me too, to be honest.
Why havent the auto elecs picked up on this? What can it be?

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  • Anonymous Jan 31, 2009


    • the altinator bleeding back

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Disconnect the positive terminal of the battery.
Place a 20 amp meter inline, (poss to battery lead, neg to battery)
And see if you have any more than a few milliamps of drainage for radio memory etc.
Anything like 0.25 amps or more and you have a component on the car that is ON.
Boot light, is it going out? 5w bulb in a 12v circuit = 2.4amps so a 75ah battery = 30 hours to dead flat.
Do you have electric windows? Is one still trying to close as in stuck relay or switch? (Had that on a porker 924) put your ear to the doors and listen for the hum.
Test 2, fully charge battery but leave car with alternator wires disconnected. Still goes flat, it’s on the car, no? It’s the alternator.

Hope that helps, Pete

Posted on Mar 31, 2009

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