Gulfstream Sunsport motorhome cruise control wiring?

Connect the brake control wire, thats the purple one to the white wire just above the brake pedal. Check to be sure you have the right wire. Using a test light, this wire will get 12 volts when the brake pedal is pushed, no power when the brake pedal is released. If you have LED brake lights, you will have to relay control this circuit. This wire must see ground when the pedal is not pushed for the cruise control to work and see 12 volts when the brake pedal is pushed to break operation of the system when stopping the coach.

see purple and white wire meeting each other.

Tie the purple wire from the cruise control harness to the white wire you have tested and verified.