Cruise control not working on 1994

[1994xlt]

I have 94 Ranger with cruise control and I cannot get it to work, I’ve tried a couple dozen times, I think one time it MAY of tried to work because my speedometer kinda froze at a speed and then dropped down 5mph but I don’t know, I took the steering wheel cover off and looked at the switches nothing looked obviously broken or corroded so I assume it’s probably another issue? What could it be and were should i start

 

[RobbieD]

Check that you have a speed pulse generator on the speedo cable where it plugs into the transmission, make sure that it's plugged in and the wires aren't damaged.

Check that the servo throttle cable is connected at the throttle, and it's not frayed or excessively stretched. Make sure that the servo has vacuum on the flexible hose when the engine is running.

LED taillights, or stock incandescent bulbs? LEDs will block the cruise seeing ground when the brake lights are off. Power (brake pressed) turns the cruise off, but it must also see ground on that circuit before it will operate.

When you're testing it, push "ON" first, then at a steady speed (a "highway" speed is best) with your foot on the gas pedal press "SET". Backing your foot off, you should fell the throttle surge if it's working.

 

[1994xlt]

Check that you have a speed pulse generator on the speedo cable where it plugs into the transmission, make sure that it's plugged in and the wires aren't damaged.

Check that the servo throttle cable is connected at the throttle, and it's not frayed or excessively stretched. Make sure that the servo has vacuum on the flexible hose when the engine is running.

LED taillights, or stock incandescent bulbs? LEDs will block the cruise seeing ground when the brake lights are off. Power (brake pressed) turns the cruise off, but it must also see ground on that circuit before it will operate.

When you're testing it, push "ON" first, then at a steady speed (a "highway" speed is best) with your foot on the gas pedal press "SET". Backing your foot off, you should fell the throttle surge if it's working.

I have stock taillights.i will look up what a speed pulse is and were if is and the servo too I probly know what they are just dunno what they look like.