i would start at the battery/fuse box and start tracing wires and making sure they are all ok i had a problem with my grizzly that anytime it was wet, the ignition fuse would explode anytime i turned the key started tracing wires and found a clump of dirt in one spot...knocked the dirt out and realized the wire it was surrounding had a small crack in it from being old and dried out....when the quad got wet, the dirt turned to mud and would short out that wire...when it was dry it worked fine...taped up that wire and good to go it could be a bad ground, a wire that is accidentally grounded to the frame, etc....just start tracing wires and inspecting them