Chasis Electrical issue - Wipers / Camera / Jacks won't work

My freightliner chassis is older than yours, but I have 2 fuse/relay boxes in the electrical run bay (directly under the driver) that were provided by freightliner and located by the body builder. I also have a third relay/fuse box in that same bay installed by the body builder, and that is where my fuses for rear camera and jacks are located. The body builder installed the rear camera and jacks.

I'd bet there is another 12 volt fuse/relay box somewhere on that coach. Maybe someone with your model will post soon.

Fred