I don't think the two systems are realted. Cruise Failure on Benzes is common when they get around the age of our cars. I am pretty sure that the problem is usually the amplifier. Its a circut board and often the solder will crack causing poor or intermittent connections. They can either be replaced (around $250 for the part I think) or removed and re-soldered.



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Jason Priest
1986 420SEL