Sorry that I can't help with a Ram, but Fords have 2 sets of fuses--the ones for the trailer are all under the hood. Does the Ram have a second fuse box?
Are you saying you have connected to the trailer and it doesn't recognize the trailer? Or are you saying you can't get a tester to show power?
Do you have a friend with a trailer to hook to and see what happens?
And most of these connection problems end up being a bad ground...
Also, welcome to the forum.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired