2016 39 mb 2018 GMC Denali. My fuse to the 12 volt constant power on my truck going to the RV keeps blowing, therefore causing my batteries to go dead before I get to where I am going. Any suggestions where to start looking first. In my opinion these RV manufactures should make available some sort of wiring diagram so we can do some of this stuff ourselves. It's not always to get to the shop with one. Then pay exorbitant labor fees for them to play the guessing game like we would do. Thanks for any help.