Your cruise control won't work properly without the 3rd brake light. For some weird reason, it needs the 3rd brake light to be functional.
Your trailer brake problem isn't the 3rd light, its the way the controller is tied in to the circuit when the hazards are flashing. I believe they sell gizmos to fix that....here's one:
Pulse Preventer for Electric Brake Controllers 5501 : Trailer hitch bike rack and trailer hitches - etrailer.com
Your trailer brake problem isn't the 3rd light, its the way the controller is tied in to the circuit when the hazards are flashing. I believe they sell gizmos to fix that....here's one:
Pulse Preventer for Electric Brake Controllers 5501 : Trailer hitch bike rack and trailer hitches - etrailer.com