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Old 09-14-2008, 07:48 AM
Registered User
Join Date: Mar 2007
Posts: 5
electrical problems 86 560SL

HAVE A 560 SL 86
electrical I have a problem with neither battery or alternator .I start the car with a new charge on the batterty and the car run fine but after a few minutes running the engine cuts out and when I turn the key the batterry is dead . I have to recharge again and then starts up again runs fine then turns off . the batterty maybe bad or alternator bad.What else may it be?

I also hear a raddle infront of engine . I shake the water pump and that feels fine, all belts are tight power streering pumpe tight a/c works good .Any thought on that??

when car is driving the wind shield wipes go on by them selfs and the switch is on the off possition Any thoughts on that??

I know im say alot here i just lost my job and have time to work on it.
That you very much
Richard R

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Old 09-14-2008, 09:25 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
sounds like bearings in alternator bad and grounds out battery when engine running.charge batt and get voltmeter check batt voltage with key off and then start car measure voltage again with engine running if alt bad voltage will be lower with engine running.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 09-14-2008, 10:49 AM
the tenor man's Avatar
Registered User
Join Date: Nov 2005
Posts: 152
Maybe you have a bad battery....

I once ruined a good alternator with a shorted battery...

The battery did hold a slight charge, and I was able to get the car started. The wrinkle was the battery had a shorted cell, and burnt the alternator.

After a new battery and a rebuilt alternator, the problem was solved...$$$.

Pull out the voltage regulator on the back of the alternator...2 phillips screws to remove it... and check out the brushes...they may also be worn.

The Tenor Man

Currently Driving.....
1987 Mercedes Benz 300D Turbo - Daily Driver.
2004 Buick Rendezvous...Smaller than it looks!
2005 Mitsubishi Galant - Not bad for a tin box...Lousey Seats
Past Vehicles.....
1994 Dodge B-250 Van- GAS HOG..Succumbed to rust!
1989 Mercedes Benz 260E - Totaled but no one injured.
1977 Mercedes Benz 240D - Loved it, but SLOWWW! - Succumbed to RUST!
1976 Mercedes Benz 240D - Same as above! -
1975 Mercedes Benz 240D - Same as above!
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