Tail/brake/reverse lights not working after replacing burned out bulbs

Hi,

I suspect someone wired in trailer lights or something similar. As far as the wiring, I attached the wiring schematics below for the exterior lights. I had to cut the pic in half to make it readable, but I did overlap them so you can follow from one to the next. If you look in pic 2, I circled the rear lighting section.

Here is a link you may find helpful when working on this:

https://www.2carpros.com/articles/how-to-check-wiring

I hope this helps. Let me know if you have other questions or need anything.

Take care,

Joe

See pics below.