For the backup solenoid for your surge brake actuator, I recommend the Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800. This will fit in line with your master cylinder and brake line and give you two wires, one that will ground to your trailer frame and one that will run to the reverse light power function of your trailer connector. I've attached a video to assist. view full answer...
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