If it is a Ford chassis, they are under the hood, in a separate fuse box, usually near the firewall. You can find an owners manual for a Ford chassis here:
If not a Ford, post the chassis make, and the tenth digit in the VIN number, that will give the year of the chassis, which may be older than the year of the coach.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT