Same thing happened to me. Going down the road a 70mph when my rpms when high like the excursion was shifted into neutral so I let off the gas. When I put my foot on the accelerator again the truck must have shifted into 1st like you said and everything went dead as my rear tire locked up. The fan clutch pigtail looks just like yours
Tutuapp 9Apps Showbox
Tutuapp 9Apps Showbox