Troubleshooting Brake Controller Install that Activates Vehicle Brake Lights When Connected

Question:

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

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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.

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Jameson C

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