Hi,
Are the battery cables tight and clean? If you are able to move them, they need to be tightened.
Do me a favor. Take a look through this link. The title indicates "Everything Goes Out." However, it discusses the importance of the terminal connections.
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
Since it starts with a jump or when you wiggle the wires, I suspect a corrosion problem, or they just aren't tight enough. If that isn't the case, we need to check the actual terminal wires to make sure they are in good condition. Something isn't making good contact.
Let me know. Also, if the link doesn't help, take a few pictures of the battery and its connections and upload them for me to see.
Take care,
Joe
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Tuesday, July 30th, 2024 AT 12:59 PM