I am slowly fixing everything. Is the cruise control amp in the circular metal garbage can in the actuator ? What are some basic tests I can run?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Do you have a vacuum-operated cruise control? I though Mercedes had switched to an electric one by 1983.

In your car, the cruise amp should be in a rectangular metal can under the dash, on the driver's side. See this link for tests: http://gdl-online.com/test023.html

See many other threads (use the search function) for other things you can do.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970