i have a 2005 polaris sportman 400 the awd stopped working i have read things sayong if the speedometer doesnt work you jave to ground the awd brown an white wire i didnt that an still nothing. when i hit the switch the awd light comes on on the speedometer an i have power to the wire going the differential. any clue or suggestions on what it may be or what i can try next to fix it. will it stop working if the fluid it low in the front diff?