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Installation of Stop Light Switch RM-751463 in Flat Towed 2018 GMC Sierra 1500  

Question:

How do you wire this switch for 2018 GMC Sierra, which requires the ground to be removed from the battery while towing. This leaves an ungrounded monitor light circuit.

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Expert Reply:

For installing the Roadmaster Stop Light Switch Kit # RM-751463 in your 2018 GMC Sierra 1500 you can follow the linked wiring schematic, which is also shown in the instructions. The switch's black wires connect to the battery + and to the supplemental braking system monitor wire, using the supplied red and green wires, respectively.

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Adam R
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