battery connected wrong on generator

[808]

Hello folks. I have a 39-6wp toy hauler with a built in generator. it is a cumin/onan generator. my generator was running. I had a bad battery hooked to it. I decided to change battery while generator was running(dumb ass). When I put new one in, I connected it backwards.(DUMB ASS) The generator then died. Now it wont start. When I push the starter button it cranks about a half a turn and that's it. Is there a reset button or fuse to protect generator from dumb asses like me. Please help