Cruise Control Problem

[RS23VOA]

Hey guys.
1970 Challenger
Trying to figure out why my cruise control isn’t working. The solenoid clicks when I turn it on and clicks when I hit the “set” button but it won’t hold. I have a new diaphragm and have good vacuum. I’ve run a ground wire from the - on the battery to the CC unit and it didn’t help Anyone had this experience they can help shed some light on ?

 

[jimbosride]

Brake pedal speed brake switch out of adjustment or not working ??

Can Anyone Explain the 70's Cruise Control?

 

[RS23VOA]

Brake pedal speed brake switch out of adjustment or not working ??

View attachment 1839595
Can Anyone Explain the 70's Cruise Control?

Brake pedal speed brake switch out of adjustment or not working ??

View attachment 1839595
Can Anyone Explain the 70's Cruise Control?

I'll check that but wouldn't the brake lights be on if that was out of adjustment?

 

[jimbosride]

I believe there are 2 switch's but not sure. My unit I had it's own switch.

 

[Dave6T4]

Double acting switch with 2 sets of leads. Pushing brake pedal down turns brake lights ON on one circuit, but shuts cruise control Off on second one.