I have a newer Freightliner, but the fuses for my brake lights, turn signals, etc, are located in the right rear where the two start batteries are located. There is a black box, about 6" x 4" with relays and fuses. I took photos of all my fuses throughout the coach and keep the in a folder. I can look in the folder for the fuse I want and then go to that bay.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab