Intermittently not cranking over?

Hello,

The first thing I would do is use a test light on the trigger wire of the starter, have a helper hold the key in the crank position. If it lights up, you have a defective starter. If no power is present then the next thing is the crank relay in the main fuse panel under the hood, here is the location in the images below and I have included the starter wiring diagrams so you can see how the system works.

The guide should help as well:

https://www.2carpros.com/articles/starter-not-working-repair

Please check the images below and get back to me.