Did you think to check main fuse panel...
(sorry.. if i missed it.)
ECM 1 and 2..
please excuse if i missed it.. I know how annoying that can be but I'm in a hurry and did not have time go over what is a very detailed post...
if it is.. then could be glow circuit or the ECM (glow circuit will thrown and ECM fuse 1 i believe!
2006 HD 2500 LLY
Union Bridge, MD