The BCC would not usually have any brake light circuits. There should be a separate chassis fuse panel, either on the front of the firewall or under the dash. The location will differ for Ford vs Workhorse chassis.
What chassis is under the Seabreeze? Most were Workhorses by 2004, but I think the Ford chassis version was still available. V10 engine is a Ford, V8 is a Workhorse.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL