Hi and thanks for using 2CarPros.
What you are describing sounds like a loose or corroded connection at the battery or where the cables connect.
If the main power to the starter came loose and touched the smaller wire on the starter, it would have engaged the solenoid. If it was not constant, the starter should be okay. However, I need you to check a few things. First, the main power wire to the starter is direct. Make sure nothing melted down or was damaged on that cable.
Next, follow this link. It describes exactly what you have described.
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
Let me know what you find or if you have other questions.
Joe
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Sunday, November 25th, 2018 AT 5:17 PM