Hey guys. Im new to the forum. I have an issue with my 2002 F250 4x4 with the 7.3. The issue im having is a chech engine light, glow plug light, no tach, a/c compressor not engaging, and an occasional miss in the engine. I sent the pcm to be rebuilt but still have same issues. Im wondering if I have a wiring harness issue. Not sure were or how to start. Any suggestions would be appreciated.