Sounds like a variety of probables;
Low amps can do strange things to all of the modules. Batteries should be load tested. Connections inspected.
Stud #1 fuse....feeds the 12v hot aux feed in your 7-pin trailer plug.
There are numerous idiot proof things in the logic to prevent devastation. One of those is the overheat shutdown. That info input would come from your ECT sensor, on top near the T-stats. Bad sensor, damaged wires to it, etc.
But again, back to the low amps thing. There's a lot of handshakes going on between the different sensors and modules at start up. low amps can cause conflicting info between them all.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
Last edited by Hook'em_Horns!; 01-13-2020 at 07:53 AM.