A picture sure would help folks to see exactly what's going on with your wiring. Without a pic, I'm wondering if there is a mechanical connector in the wire or the tongue where the wire might have once been attached?
Also, is the wire sleeving stripped back an inch or so that would allow a mechanical/electrical connection? Are there any clamp marks on the wire?
As you can see, unless someone has your exact RV, it's pretty hard to guess what's going on.
Days camping (2016)----181 days
Days camping (2017) --- 52 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
12 different RV's