I have a 2011 grizz 450 with only 900 miles. I had it out the other day, had to engange diff lock to climb a muddy hill, and it wouldnt engage, the light was just flashing. so I dis engange it and drive it home. shut it down. today I go out to start it, i have no life from it. turn the key on and nothing happens, no display or anything , the only thing i have done to the electrical system is a year ago i grounded the reverse wire to get full power in reverse. I tested my battery, its nice and full. so where should i start looking maybe for a lose ground? where are grounding locations?
thanks

mark