In the bumpside trucks and up,including 1988 (but not limited too), if you install LED tail/Brake lamps your factory cruise will not work.
The cruise grounds through the brake lamps. LED won't flow enough current.............By design, applying brakes sends current to lamps and cruise loses ground to cancel.
1975 F600 Tow Truck
1978 F250 Crew Cab Ranger XLT SB 460 C6
1978 Bronco Ranger XLT EFI460 C6 4X4
1978 Bronco Custom 400 C6 4X4
1986 Bronco II 4X4
and a bunch of others