Welcome ronaldburr
The wiring harness in the shifter assembly is probably chafed. Pull the cover and inspect. You should be able to fix this issue yourself. I would imagine some solder and heat shrink tube and you'll be good to go. If the wires aren't broken maybe the solder won't be necessary. Let us now what you see under there.
I came across this diagram. I think it should be the same for your truck: