2002 sportsman 700 Twin. When I got it the 4wd only worked when holding the override. Replaced the shift switch and that solved the problem. All of a sudden today 4wd stopped working. The 4wd light seems to flicker a little but till I hit the throttle. Pressing the override doesn’t do anything. I unplugged the connector to the diff. Switch off it has only volts to both wires. In park reverse and neutral with switch on it has 12v to both. In drive or low. Or reverse with override pressed I have 12v to the brown wire and 6 to the grey wire. Should these both be at 12 volts? Anyone else had thus problem?