1994 f 150 4x4 302 cruise dont work

have a 94 f150 every thing works but the cruise and i need the cruise ,when you hit the on button you can hear a clicking from under the dash ,,i think its comeing from under the dash hard to tell when you have to watch the road ,it worked when i bought the truck ,but would release when driving then it just didnt work would like some help and maybe a wire diagram

thanks

slowroast

slowroast

Is the truck a manual or auto? Check to see if your brake pedal is sagging (or clutch pedal if MT). Sometimes there are two brake switches, one for cruise cancel and one for brake lights. If your pedal is sagging then it can trip the cruise cancel switch. You can also try lifting the pedal with your foot while driving to see if cruise will engage or not. That is the easiest thing to check for that I have encountered.

first things i checked and no to all the truck is manual shiftslowroast

Have you physically checked the under hood linkage? Try pulling on it, also ALL the fuses.

Then we are looking at switch or unit. This is where you will need the wiring diagramme and a DMM I'm afraid.

Your local library but you won't be able to test without a DMM.