I pulled a rather heavy vehicle that died today so l locked the hubs, pulled up put it in 4low and pulled it back. When I put it back to h2 and hit the button to turn off 4wd it won't disengage. If I put the tcase in neutral the light turns off then when I put it back in h2 the light goes back on, even with the button turned off. I can feel it still engaged when I turn. I parked it and left the hubs locked, but not sure why it won't come out of 4hi.