Ok...this is getting more weird by the day. I bought the following 50 amp resettable circuit breaker off amazon
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I didn't even install it yet and all of a sudden the slideout power works. However, the lights on the slideout still don't work. Should I still replace that rusty circuit breaker with the new one I just purchased above or is the light issue something else? I have a Sperry DM-350A multi-meter and I'm going to give it a shot but I have to say, I'm not a pro at using it.
Thank you all again for helping solve this mystery.