Chilton's checklist
Blown fuse (fuse 23 interior panel)
Short or open in cruise control circuit (check for ford sb)
Faulty brake or clutch switch
Leaky vacuum circuit
Faulty cruis control switch
Faulty stepper motor
Faulty transducer motor
Faulty speed sensor
Faulty cruis control module
Check local library for copy or purchase one
Good luck,
Karl
