not sure on your type of cruise, they way I figured mine out was by going to Chevy and getting copies of the cruise system and then determining what each part's function was, by process of elimination I found out what was wrong with mine. Not much help, but understanding what each part does makes it alot easier to figure out.
1985 Monte SS, Rebuilt L69 with TPI. 200-4R Tranny. 951 Modine with TPI duel fans. True 2 1/4 Flowmaster Duals. B.F.H. made dual hump crossmember. Stock Suspension, interior, and body.SOLD TO INTMDATR3 ON 03/04/06