Ok got off work went to start truck grid heater kicked on raptor started pumping etc no problem then went to turn it over i got one loud click the. Nothing all power was gone windows radio etc went to terminals found the positive off my main battery that leads into the fuse box was hot .....so i pulled it apart little corrosion nothing serious but i cleaned it anyway and bolted back together truck got power again raptor grid heat etc .....went to start turned once then click nothing 😑 left my truck at work any ideas were to start in the am worked a 13 hour day and wasnt wanting to mess with it anymore in the dark any input appreciated thanks again

 

So have you checked the conections @ both batteries, the starter,... try the torch with some solder which will complete the circut better ..