electrical problem w/ brake lights not working, replaced all fuses and bulbs. when head lights are there is no brake lights. when turn signal is on then both signals flash abck and forth.. i can not figure it out ??? does anyone have any ideas??
no brake lights.. having electrical problems.. on 1990 GMC 3500 Pickup
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- First, my truck is not a "Pickup", it is a GMC 3500 HD Commercial Box Truck.