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Old 10-23-2002, 10:24 PM
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Join Date: Sep 2001
Location: Jackson, Michigan
Posts: 4
Question 129 Electrical Problem

I have a 1991 500SL which has an electrical problem I have been chasing for quite some time. Had 2 problems and have solved running problem by replacing fuse on over voltage protector, but I am still not getting power to the accessories. (windows, Radio wipers ect.) Studing the problem and listening to other cars you can hear a relay click passenger dash side when key is turned. My car is silent. Have most of dash out and juction box under hood exposed but am not finding relay. Any ideas or does anyone have a wiring diagram for this portion of the car. I am really frustrated and would love to have this thing back on the road.
Fred M. Hetherwick
900 W. North St.
Jackson, MI 49202

(517) 796-1700
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Old 12-05-2006, 06:39 PM
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Location: Lake Geneva, WI.
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Old 12-10-2006, 11:29 PM
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
Possibly the ignition switch. With key in position "2" check power to the fuses that feed the non-working accessories.

Schematics and much more are on the R129 Tech DVD available for about $70 from MBUSA.
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