Thanks mate, i have a good feeling that you'll be able to get me cruising again!
I've recently completed an engine conversion m111 220 to m104 320. yes - over here in the UK we have a 4 pot version for the 124 which i should add is a wonderful unit
however needed a bit more oooomph!
Lets however disregard the engine swap as it doesn't hold any bearing on the issue with our cruise issue. Its hooked up independently. (The M104 engine i swapped out for didn't have cruise to begin with so no fancy electronic cruise throttle body nor the fancy VDO unit in the passenger footwell!
I'll need to double check the part number on the unit but i'm sure your expert eyes will be able to figure out its either or from the below pic of my components prior to retro fitting to the car. The part numbers you mention sounds familiar + the blue rear where the pins are on the amp might help distinguish?
If you have an amp knocking about i'd be inclined to swap it out with one of your fixed units to be honest, what do you reckon?
If you need any further info let me know bud and thanks for your help!