I had a MH with 2005 FL XC chassis, there was a fusebox,4" x 4" in the basement on the passenger side by the rear wheel with all the fuses for the
7 pin trailer connector.
Siggy & Ursula.
2011 Newmar DSDP 4020 (no Tag, no DEF, 07 emission),
FTL XCR ,ISL 400,2015 Jeep Cherokee Limited, 4x4, V6, Active Drive II, BrakeBuddy