Question about Mercedes-Benz 190-Class

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Have a vito battery keeps going flat new battery fitted left in with auto electrician still no joy at sorting problem

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  • markinaark Nov 05, 2008

    have a mercedes vito 2.0 diesel battery keeps going flat( been draine) i then fitted a new battery still same problem . left in with auto electrician he removed all the fuses and put a meter on battery still battery been drained , he went as far as checking at the alternator. still no joy at sorting problem.

  • yadayada
    yadayada May 11, 2010

    What is the question and the symtom??



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Check every accessory light in the car, boot, glove box, bonnet , vanity lights in the visors, these are the usual culprits for draws, I have seen a bad diode in the alternator cause this,To check that disconnect the alt. and see if the draw goes away.

Posted on Nov 05, 2008


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Car batterys cant all be faulty?

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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

Dec 09, 2008 | 1987 Mercedes-Benz Mercedes Benz 190 Class

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