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cruise control module has failed. or if your brake lights are staying on, then brake light switch has failed and not allowing cruise to engage. Have someone stand behind truck and see if brakes are working properly, if not- replace brake light switch. if fine, then swap out cruise control module under hood.... prob find one at a junk yard.
Cruise control deactivates once you press the brake pedal. The brake switch us an input to the cruise control module. So it is possible that your brake switch went bad keping the lights on and making the cruise control module think you are applying the brakes when in fact you are not. Replace the brake light switch and check operation.
When I owned my 1999 Grand Caravan the "clock spring" went out and I lost my cruise control ( don't remember if the horn quit too). There was a recall on it and the dealer changed if for free and it cleared up the problem. The clock sping is in the steering coulmn under the steering wheel and it's what keeps connections for steering wheel controls.
First-on dashboard right hand side of steering wheel there are large (approx 1" sq) buttons-push to turn on-push again to turn off-for the rearwindow defroster,hazard flashing lights and....cruise control. Push cruise button to "on" and you'll see green lights on speedometer bezel light up. On end of wiper control stick on rightside of steering wheel-you'll find a pushbutton. Get car to speed you want-then push this button in. To turn off cruise control completely-push first button you pushed on dashboard.
Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.
As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.