Using Google image search, your fuse block is like those used in GM pick up trucks from the late '70s forward. Since your RV is a '94, you could look in a Chilton or Haynes manual for a '94 GM/Chevy pick up.
The other strategy would be to pull a fuse, see what's off. and make your own diagram of the fuse panel. Good chance, since it's not labeled, the fuse locations could be used for other circuits. If you have access or wish to purchase one, a 12 v circuit tracer is also a good way to figure out the circuits. http://www.ebay.com/itm/6-42V-Car-Au...JXVRF0&vxp=mtr