3rd party would be easier
Cruise has just 3 parts but multiple wires
1. Actuator is in the engine bay and is what pulls the throttle open, it uses engine vacuum.
2. Amplifier is what "they" call the Brains of the Cruise, it connects to drivers controller and actuator
3. Control buttons, drivers interface to control the system.
1. and 2. are often combined on some systems
Connections that are needed
Vacuum release, vacuum dump valve in cab on brake pedal rod, this is a backup system, it doesn't shut off cruise control but it releases vacuum in actuator so releases throttle, in case brake light switch fails to do so.
Brake light wire, turns off set speed if brakes are used
Clutch switch, if manual trans, turns off set speed if clutch is used.
Neutral switch, if automatic, turns off set speed if Neutral is selected on shifter.
VSS(vehicle speed sensor) tapped, to get amplifier a pulse related to speed.
Cruise control doesn't know what 60mph is or 40mph, it gets pulses from a sensor or in the old days a cable.
If you are driving at 60mph and hit the SET button the amplifier looks at the Pulses per minute, say it is 500, amplifier then causes actuator to pull on the throttle until pulses go to 501 then back to 500 and maintains that pulse count.
Yes, you would have to change steering wheel and clock spring(wire under steering wheel)
Clock spring allows horn and air bag to stay connected when steering wheel turns, it is a flat ribbon wire that is coiled up under steering wheel, looks like a coiled flat spring on an old style wind up clock, hence the name "clock spring"
This wire needs enough separate wires in it to handle adding cruise buttons to steering wheel, and it might have them...but have to pull steering wheel to find out so........
3rd party use dash mount or turn signal stalk mount.
Because of the brake, clutch, neutral, VSS, amplifier and actuator wiring needed the main wiring harness would need to be changed, or a Ford Cruise harness disassembled to get needed wiring out and spliced into your harness
Last edited by RonD; 10-03-2016 at 11:14 AM.