I do appreciate your input.
I could not see in the pic you posted which direction the tapered down side is pointing. The BRN wire or the T-stat?
Sorry, I should have said what model I have. My Atwood is a GH6-7E (Gas/Heat exchange with electronic spark). The 12 vdc comes from the switch in the coach, thru the Thermal Cut-off link, thru the T-stat and THEN to the Control BRD. If all safeties are met then the gas is turned on and the spark applied. A little different from the Electric/Gas model.
I literally removed the Thermal Cut-off link and used a wire with clips to connect the BRN wire to the T-stat. If there was a short in the BRN wire it would continue to short even with the jumper in place. I know it doesn't make since that the 15 amp fuse only blows when the Thermal Cut-off is used.
At this point I am thinking the Spark Electrode is causing some kind of load on the circuit when the Thermal Cut-off link is in and blowing the 15 amp fuse. I have a new Electrode coming tomorrow. We'll see...