Starter/Electrics Trouble (Not Relay)

Hey Guys,
So I left my 2007 Grizzly 450 outside in the rain last night and, when I went to start it this morning, there was no power at all(no display, crank etc.) After fiddling with the wires for a bit, there is now power to the display and the relay clicks when I try to start it- similar result when I jump the relay terminals.
The battery is reading 12.5 volts. However, when I flick the main headlight switch to the on position, the ATV loses all power.
Any solutions?