Brake controller energized on park lights not brake switch
Hows this one for ya? New to me 03 GMC Sierra 1500 HD. Brake controller is energized on park light circuit, not brake light switch. All lighting works correctly on both vehicles. Obviously miswired or shorted but where would be the most logical starting point to troubleshoot? Any one got any input on this one. Worked fine on previous TV, 01 Silverado. Using factory supplied 01 Silverado jumper from Tekonsha prodigy controller to Sierra. Do not believe TV wiring is different, 01 Silvy to 04 Sierra??.
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