Hi,
From your video you supplied us it looks like you are loosing complete system voltage when you turned your steering wheel. I would double check all battery cables, positive side and negative side on both ends. On the engine, frame, body and starter, and Battery. Check and make sure you have a good clean and tight connections.I am including a wiring diagram below and marked the connections to pay special attention too. Also check around the bell housing with a good flash light. I hope this helps you out and please let us what fixed it.
Thank you
Joe Terwilliger
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Friday, December 13th, 2019 AT 2:01 PM