02 powerstroke problem

intermitent electrical problem, no interior lite, no instrument cluster, no power windows and the "check gage" idiot lite is on. I checked all fuses and connectors, I dont have a shop manual but the owners manual doesnt list all of the components for each fuse or relay.
Any help?? we live in the Mountains and it's a pain in the A-- to take it in

first off, see what the check engine light is on for, autozone has scanner available to use. Also check all of the body grounds, that could be your problem right there.