'16 2500 159 HT Granite Window - OH(io)
There are relays and associated fuses in the PDC under the hood near the steering column. T2 and F14 for the front, and T17 and F9 for the rear. (You may not have the rear outlet depending on options)Does that switch at the fuse block or somewhere else? I am assuming that it is a 15 amp / 12 volt source?