I got a new voltage regulator and was undoing the wires in the battery box and I messed up a part, not sure what it does or what the name of it is. It has two connection spots on it, one screw that the regulator wire hooks to has another wire with it and the second screw has one wire alone on it . The nut was rusted so i sprayed it with wd40 to hopefully loosen it up but when I went to back off the nut the whole nut and post broke lose and turned

 

I believe that's the main 50A circuit breaker 74600-94A.

 

^ what @GalvTexGuy said.

I had the same thing happen to me when I was replacing the voltage regulator on an '06 softail deluxe I had. I just ordered a new one online and everything worked out smoothly. Here's one I found on eBay after a quick search...
https://www.ebay.com/itm/OEM-Harley-...8AAOSws9xeXum9

 

Dito on the circuit breaker , #25 on Ronnie's parts page . You should create a signature and put your bike's info in it , makes it easier to help you .

Welcome to the forum !

https://partsfinder.onlinemicrofiche...UIT%20BREAKERS

 

Thank y’all so much for the help! Will be ordering it tomorrow and try to get it installed!

 

Just a heads up ... Disconnect the battery .... Negative cable first ... When done connect battery negative cable last ... Good luck :>)