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The 99+ trucks have the fog switch integral with the headlight switch.
You'll need to get the harness for the lights too. IIRC, the harness plugs into a plug somewhere on the frame/bumper.
I have unused connectors in the area where the fogs go. So part of the wiring is there. I may attempt to take the headlight switch out and see if there is a connector at that end, then all I have to do is replace the switch.
Anyone have a photo of the back side of headlight switch with fogs?
And I just bought seat fabric on e-bay. This has been like a monkey and a football!
The circuit for fogs is in the black connector, (at the headlight switch) pin 7. With the lock tab on top, looking into the connector, it will be top left. should be a light blue wire there.