Glow Plug Conductor gets red hot drivers side. on 2004 Chevrolet Silverado 2500 HD

2004 Chevy 2500 HD Duramax glow plug conductor bar gets red hot on the drivers side. need advice if anyone has seen this problem and if it's just the conductor bar or the glow plug control box. I'm afraid of burning up the wire harness and haven't tried starting it since.