This sounds like alot...
I guess to start with... I think every cm of this truck has been fingered...motor has been swapped and idk what else... looks like trans has at least been out... most of.the work looks very amateurish... ive had to tighten up stuff... like.water pump almost fell off... suspension components were loose... it has a 3" body lift so that has alot of stuff unclipped/unfastened...
so let's start with grounds... where are all the grounds supposed to be... I will disconnect and clean them all and then if needed move to the next step...

 

The dash switch for rear hatch and wiper is good... rear hatch opens by rear switch...

 

Here you go.


George