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Here is what I have from my diagram - - the wire from the fuel gauge on the dash to the sending unit in the tank is purple. Not the pump. The wire from the pump to the pump relay is gray. The wire from the relay to the 10amp fuse is purple. The wire from the relay to the computer is orange. The wire from the relay used to power the pump to prime it is red. And the ground wire for the relay is black-white.
there could be a broken wire in the steering wheel which would mean possibly having to remove the steering wheel but there will be an air bag that could go off which would be dangerous so its best left to the professionals unless you know exactly what you are doing as regards taking off steering wheels.
If you have a block heater, there will be an extension cord type plug somewhere near or under the front grille (sometimes you need to find the heater and follow the wire to find wherever it got tucked in) That gets plugged into an extension cord from the house power.
use a testlight turn on the LS light ground the test light touch the pin inside the lamp socket if it lights look for a bad ground if it does not check your fuses or, run a new power wire under your truck secured with zip ties from the switch