Finally got my cruise control working
 

Been messing with this thing on and off for a couple of years. 77 Chevy 3/4 ton Camper Special with factory non-resume cruise.

Basically it needed everything. I found a NOS diaphragm on eBay. Found some beaded pull-chain from a ceiling fan to connect the cable to the diaphragm. Got a new vacuum transducer, rebuilt from Oreilly's. Fixed a bunch of vacuum leaks. And finally I found a mess in the electrical wiring on the brake cruise disabling function. A previous owner had installed (badly) a brake controller that had been disconnected and taped off and once that was put back to normal, it worked.

It needs adjusting because it speeds up about 4 mph after the cruise is enabled but it does work now.

Re: Finally got my cruise control working
 

I am glad that you got your cruise working it remined me about a 82 suburban I has working on. the factory cruise it wasn't working properly so I was fooling around with it one day I had just left out the driveway and the truck got up to about 45 mph so I pushed the button and when I did the vacuum diaphragm sucked up and it held the throttle wide ass open it jumped up to 60 mph quickly I tried not to panic but I was headed towards the hwy I tried everything to get it to stop but the suburban kept getting faster and faster I hit the brakes as hard as I could it did nothing it just kept going I cut off the key and that didn't work so I then had to shift it up into netural it was screaming running wide open at about 7000 rpm but I was able to get stopped before I had to stop at the hwy I just knew it was going to spin a rod or something but it made it thru and after that I took off the vacuum diaphragm off and thrashed it . lesson learned

Re: Finally got my cruise control working
 

That's good news.

When I bought my truck, mine didn't work either. But when I put a new Edelbrock Carb on, I saw the rod wasn't set to the side of the carburetor. It was missing the little clip that kept the rod from sliding back off.

Re: Finally got my cruise control working
 

I had to get the cable connected to the carb too. Forgot to mention that in the OP.