Need help with DBW cruise control

[GMCwantsLS1]

Great find! Sometimes without all the information the engineers have you have to just copy the circuit and find out why it works.

[Formula400]

OK everyone..the fight is over....finally figured it out this weekend with the help of a friend. I'll post it up shortly how everything went down. Turns out, the stop lamp switch on the new trucks need to come from an electrical line that has a brake light bulb in it. When I ran just a relayed 12v signal to the TAC module for the stop lamp switch, it was never seeing the resistance of a brake light bulb in the circuit and hence wouldn't work. I found this tidbit out and hooked the stop lamp circuit into the line that turns my brake lights on (directly out of the brake pedal switch) and BAM! Worked like a charm.

I'll do a writeup on this whole venture now that it is done...DBW cruise in a 1993 ftw....also, since we figured out how to do this, we hooked up my buddies 1968 Chevy w/ 5.3L DBW with cruise as well. Wired the set and cruise on to one of his pull knobs in his dash...looks super clean and factory...even for a 68'!

Thanks for all the help guys.

Cody B.

Cody B,
Did you ever post your completed write-up anywhere? I am doing the exact same thing in OKC. Swapped an 04 Cadillac LQ9 into a 93 GMC. Still messing with the cruise and a/c. Any help would be greatly appreciated. Thanks to you and GG for the great post so far.