Can someone supply me with a trouble shooting guide for the cruise control for the 240D/ 1981.
I have vacuum at the acutator, and the fuse checks out good but the system seems to be dead when I attempt to activate it from the selector lever.

Thanks
Howard

Skip troubleshooting for now. Resolder the solder joints in the cruise amp.

Sixto
95 S420
87 300SDL

I will let you know how it works out....btw, is the amp located beneith the dash or is it hidden somewhere else?

Howard

In the W126 it's in the lower part of the dash sort of attached to the steering colum. I don't know where it is in a W123 but I'd check the same place.

Sixto
95 S420
87 300SDL

Hmm... if the cruise control of a 240D has an engine rpm signal even if the car doesn't have a tach then check the archives for the various tricks to revive a lazy tach amp.

Sixto
95 S420
87 300SDL

I don't think your last response about a tach signal was suppose to be sent to me. My 240d does not have a tach...
I won't be able to work on the it till after the 4th....I am working on my 23 Ford Model T roadster so I can be in the 4th parade.....

Again I will post my findings with my C/control...
BTW. My 240 D also drips oil around the rear seal.....Is it realistic to believe I can fix a rear seal leak on an engine that has 275k by just replacing the rear seal?

Be nice......smile...
Howard