mine started blinking after i swapped out the rear diff. cant figure out why that would make it stop working.

 

Many times the problem is with the speed control switch mounter above the brake pedal. there are two switches there, one for the brake lights and the other is the speed control cancel switch. That switch is the top one, with a brown wire with a white stripe and a red wire with a black stripe attached to it. This switch may be faulty, or adjusted incorrectly. The switch should be closed when the brake pedal is released, and opens when the pedal is depressed slightly.