Hi,
I have to be honest. It sounds like a bad ground. When you turn the lights on, the ground can no longer support the draw. Start by making sure the battery terminals are clean and tight. Next, check any wire from the ground cable to the body and the engine block to make sure they are clean and tight.
Let me know what you find.
Joe
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Friday, December 13th, 2019 AT 6:52 PM