So my 2015 Silverado 2500 HD was not charging the trailer battery while in-tow. After a little research I realized the towing package comes pre-wired for it but they don't include the fuse to make the charging pin work. Looking under the fuse box cover i noticed fuse 1, 2, 14, 15,16, and 17 are all for the trailer. I placed a order online for a micro JCASE 30 Amp fuse to replace the dummy in location #2. I really hope that does the trick because the darn micro fuse was not easy to find.