This is what is inside the reel. You have a burned up contact. I could not get parts to fix ours. Had the whole reel replaced at a RW rally in 2018.
I opened up the end of the metal box around the reel and undid the cable going inside the RV from it. I added a plug to it. I pulled all the cable off the reel, took the cover off the middle of the drum and undid it, and pulled it out. Added a plug to it and used it that way for 6 months.
There was/is a company on Ebay that sells damaged reels. But they wanted almost as much as you could buy a new one for.
2015 Ram 3500 SLT Mega Cab DRW, SS Nerf Bars, Andersen Ultimate Hitch, ATTA Freedom Fill System
Living Full Time in a 2015 39MB Tan & Burgundy Urban Clay/Caramel, Wineguard Dish, Res Fridge & Induction Cook Top, myRV Linc Remote, MorRyde SRE 4000, Titan Disk Brakes, 17.5 Goodyear G114's