1994 dodge 3500 cummins turbo diesel meltdown. i have wiring schematics and obviously the previous owner wired the truck to his preferences. Where do i start putting this beast back to its factory settings? so confused at this point and really need help.

 

That is going to be up to you, and it will depend on a lot on just what the previous owner did to it. Do you think it would be easier to just replace the entire harness?