Hello,
The starter relay is called a park neutral position relay. Here is a guide to help you test the relay once you find it:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Below are the fuse panel and relay locations for the entire truck keep this page in your favorites for future reference. I includes the wiring for the starter as well.
Check out the diagrams (below).
Let us know what happens and please upload pictures or videos of the problem.
Cheers, Ken
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Wednesday, March 7th, 2018 AT 1:55 PM