My 1985 300SD is a great car. Recently painted, it looks as good as new. I plan to keep it and miss the cruise control that has failed over the past year.
I had my trusted shop test the system and install a new actuator. He did not encourage this repair saying he'd had no lasting success without the amp as well. Since it was intermittent, the feeling was the amp would have enough left to work with the improved actuator. It worked three times and quit.
I have installed two used amps and neither worked. Plugging the old amp back will get me one or two uses, then nothing. I am sometimes able to accelerate using the stalk, but it will not hold the speed.
Should I buy a rebuilt amp or is there another problem?