Ram ProMaster City Wagon - 2015 Fuse Box Diagram Ram ProMaster City Wagon - 2015 Fuse Box Diagram. Home; Ram; ProMaster City Wagon - 2015 Fuse Box; POWER OUTLETS. There are three possible 12 Volt Power Outlets in this vehicle. Passenger Compartment Power Outlets. The passenger compartment Ram ProMaster City (2015-2017) Fuse Diagram • FuseCheck Fuse box diagram (fuse layout), location, and assignment of fuses Ram ProMaster City (Tradesman, SLT, Wagon, and Wagon SLT) (2015, 2016, 2017). Checking and Replacing Fuses Fuses protect the car’s electrical systems from short circuits.