Well I'm fixing the windows on a 2003 Cummins. I'm pretty sure the ignition switch is at fault. There is a wire from the ignition switch down to the circuit breaker, then continues up to the door module. I have continuity from the switch to the door module, but the power through the switch isn't working. Does anyone know the P/N for this switch? Its a 2003 2500 QC Cummins.