Question about 1987 Mercedes-Benz Mercedes Benz 190 Class
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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Simple test called acquiescent current drain test
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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not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition
coil or injectors getting cracked or dirty and needs to be cleaned.
confirm the problem, the basic troubleshooting is required.
this link below and follow the troubleshooting:------
This will help.
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