There is a large circuit breaker / fuse in the power cables , within 3 feet of the battery bank , there is one in each power cable; coach/chassis. That run to the front of the coach.
Mine are mounted on the frame rail just behind the battery tray; and accessed from under the coach.
Why these aren't mounted in an accessible spot is anybody's guess.
Arrow in photo is the starter relay , the other two items, are the circuit breakers.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.