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Hello, are you getting power down to the Starter itself? Using a test light is the easiest way to check it. I will put a guide here for using a 12-volt automotive test light. It's a great tool, you will be able to check many circuits with it. There is a Fusible Link on this truck and also the Transmission Range Switch. Diagrams are below. The Fusible links can be burned in half inside, not allowing power to get through. They are a black colored wire that looks like a higher gauge wire section. Usually, they are near the battery. Also check the Ground connection G101 on the passenger side front fender.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse