Hello,
Here are the power distribution wiring diagrams for your truck you can see the floor shifter, shift interlock and instrument cluster can be the only thing causing it unplug them one at the time to see which one it is (have fuses ready).
Here are the diagrams so you can see for yourself. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Cheers, Ken
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Wednesday, November 7th, 2018 AT 11:12 AM