Reverse lights stay on when I turn my headlights on...

I have a Freightliner Century Class s/t 2007 with a Detroit 60. The harness to the taillights was corroded and didn't light up correctly. After fixing them and putting them in correctly. I checked that when I take it out of reverse the reverse lights turn off. It did. The next morning because I have a habit of putting the gears in neutral the day before I went ahead and turned the key. The engine turned and made a noise. I want to say it sounded like a snap. I realized it was in reverse so I put it in neutral. I turned the engine on and everything seemed fine except the reverse lights stay on when the headlights are on. What did I break and how do I resolve this issue? Thanks in advance!

 

Will the reverse lights work after that or do I replace it?

 

W34688