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You need a Auto Electric guy ( 12 V expert ) I have the Factory Drawings ..But If it was x Fire you might need to contact the Outfitter for their Diagram ......I use a Multimeter and a Probe...and use my Factory Book...It is Impossible to Diagnose Electric Chit online....Good Luck
As already offered you need at bare minimum the factory wiring diagrams or an EVTM as they're otherwise known---typically can be found for cheap on eBay. They would include fuse information too---just as an owners manual will do.
Because we don't know what was done to arrive at your current condition it is difficult to suggest what to do without seeing it all in person.