Troubleshooting Brake Controller Install that Activates Vehicle Brake Lights When Connected


With trailer on truck, controller reads no trailer And truck brake lights stay on even after unhooking the trailer. Had to unhook the g2 to get truck brake lights out


Expert Reply:

Sounds like the wiring of your Hayes G2 Brake Boss Trailer Brake Controller # HA81792BB needs to be checked. Can you verify that the black wire of the controller is ran to a 12 volt power source, the red to a circuit that only sees voltage when the brakes are applied and the blue to the output circuit of your 7-way? The white should also be grounded but since your controller is coming on it sounds like that circuit is properly connected.

expert reply by:
Jameson C

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