I have a 2003 2500 6 speed and ive been having wiring problems. I have no power when the key is off. The door locks the horn the headlights and all the other stuff doesnt work when the key is off but everything work fine when the key is on. Also the OBDII port doesnt always work. The code reader kinda flickers on and off when i plug it in. Ive checked the fuses and still have no idea whats wrong. Anyone got any ideas?