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Hello, I'm Danny.

It sounds like you might be having an issue with the starter solenoid which is a component combined with the starter motor on your truck. Here are a few tutorials show how a starter solenoid works and removal and replacement:

https://www.2carpros.com/articles/how-a-starter-and-solenoid-works

https://www.2carpros.com/articles/how-to-replace-a-starter-motor

Once you have the starter motor-solenoid assembly removed all auto parts store will test for free. I've attached picture steps below on how to remove and replace the starter assembly on your vehicle. Hope this helps and thanks for using 2CarPros.