Battery voltage drops to 5V with negative connected on a Ford Edge

I had similar on my '05 Ram. Battery kept going dead. No parasitic draw issues while testing.
One morning I go out to the truck and the radio is playing. Truck is locked and key is in my hand. Open the driver door and the "key in ignition" chimes start up.
WTF??
Give it a smack under the wheel and it all stops. Took a video of this happening as it did this more than once.
Changed this and no more issues since..........
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