How to Tell if a 7-Way Has 12 Volt Circuit Active for RF Brake Controller Install

Question:

Hi, I have a 2015 Benz GLK250 with class II factory installed hitch7-way plug. Im trying to tow a camping trailer required to install an electric brake controller and the dealer told me it need a 12V power for the brake unit. Does my hitch plug7-way provide 12V power for this or do I need any parts? Thanks,

asked by: Joshua

Expert Reply:

Most likely the 12 volt circuit of the 7-way on your 2015 Mercedes Benz GLK250 is active from the factory. You can test this by using a circuit tester like part # PTW2993 to test the pin in the 1:00 position for voltage. There should be voltage there all the time or at least with the vehicle on.

If the dealer said you needed power there most likely you would be installing the RF Brake Controller part # TK94FR as that is the circuit that powers it.

If the circuit does not have voltage you would need to run a length of 10 gauge wire like part # 10-1-1 (sold by the foot), to the positive terminal of the battery in your GLK250 through a circuit breaker like part # 9510.

expert reply by: Jameson C