Hi,
If you look at the attached pic, I included the wiring schematic for the back-up lights. The wires at the socket should be white with a green tracer. As far as checking, let me know exactly what is happening. Also, here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Let me know what I can do to help.
Take care,
Joe
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Saturday, March 27th, 2021 AT 9:35 PM