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Old 07-14-1999, 03:24 PM
Reed Smith
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I have an 85 300SD Turbo Deisel. For some reason, sometimes when I hit a bump, tach and ac compressor go off. This may last for a few feet, or many miles, no matter how bumpy the ride, then they will both come back on. They are never on or off independently of one another. I have heard that the 84 & 85 models had some kind of "electronic control box." Any input? Thanks.
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Old 07-14-1999, 09:08 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Whenever M.B. builds a car w/computer they include overvoltage protection. On your car the O/V relay is in the fuse box. It could be loose or going bad, check it out!
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