sounds like the cruise control amplifier
I repaired mine by simply blanket resoldering the board, works like new
again, and was totally dead before. if your hopeless at soldering, pay
someone else to do it, or just buy a new amplifier.
Unless you're adept at soldering on printed circuit boards, you should
go sit at the feet of these good folks:
This same problem occurs across MB model series, and is fixable.
'78 450 SL - 211K miles
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