I have a weird issue with my 05 sportsman. Somebody but a car battery in the back storage compartment. Decided to put a battery in the regular spot. When I put power to it the fan comes on without me having the key on. Also when I try and crank it over the starter spins but turn the engine over. So weird but anyways the red battery cable is ground and the black is power. Quad turns over fine with it that way but when you take one of the battery cables off, the whole quad shuts down. Also where the battery is supposed to go was a starter solenoid. I was wondering if having the battery cables backwards is a bad thing? Or have any of you guys seen something like this?