I have a 2003 Ford F250 SD Pickup truck, with a light bar setup and controls in the cab. For whatever reason, I CANNOT get me blower motor to work for my AC or Heat?! I have replaced the resistor, the blower motor, the control knob in the dash, just about everything I can think of. It simply will not run? Could it be a ground issue with the Lightbar setup & console? If anyone has any experience, could you tell me how I could troubleshoot this problem? I have some knowledge of electrical but I am no expert for sure. This is driving me crazy and I can;t use the truck in rain, high heat, and cold weather. I also have no defroster. Thanks for any help or advice!! I would bring it to a local garage, but I am currently unemployed and money is tight.