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Hydrastar works well with Fords original equipment brake controller. Probably want to confirm that it is compatible with your GMC without aftermarket kit. Also when installing be sure to ground to truck and not to just the trailer frame.
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Frank and Marilyn
2014 3402RL, Sailun S637/Disc Brakes
2015 F350 CC LWB SRW 6.7L PSD FX4
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