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I'd check in your owner's manual first. Mine has a pretty good description of all that stuff. If you don't have one, or can't figure it out let us know.
Don't be insulted, but are you deliberately looking for the power feed to the MAIN G/P relay?
The "main" g/p relay is the big guy mounted to the front end of the passenger side v/cover. Looks like a Ford fender-mounted starter relay. This is the guy that ususally fails.
I guess there could be a relay in the power distribution box that feeds the trigger cicuit of the g/p relay but I haven't heard much in the way of problems with that...
If you don't have power to the g/p's, I'd check the main g/p relay first!