Electrical problem? 85 300SD - Mercedes Forum - Mercedes Benz Enthusiast Forums

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Old 06-04-2007, 10:19 PM
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Join Date: Aug 2006
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Default Electrical problem? 85 300SD

Just wondering if there is any common link between the power antenna, climate control, cruise control, and glow plugs on a 85 300SD. I changed the climate control just after I purchased the vehicle last year. Initially the A/C compressor came on momentarily then stopped. In the winter the heat is either on or off no temp control unless I turn temp all the way down then no heat or A/C just outside air. After rechecking installation of the climate control a few times the power antenna stopped working. Cruise control initially worked intermittently and now neveer does. The glow plugs seem to work because the engine starts better after turning on the ignition and waiting till the buzzer stops (no glow plug light). I performed the glow plug relay check from the manual and it indicated I need a new relay. The plugs are getting power (checked with a volt meter) just no light.
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1985, 300sd, 300sdl, ac, antenna, benz, control, cruise, electrical, mercedes, problem, relay, short, stopped, working

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