I was driving down the road, and lost all power to the wheels, pulled off and put it in 4 wheel drive and locked the hubs, still no power to the wheels, finally I put it in low range to load it on a trailer and had power to the wheels. Got it home cranked it up and had power to wheels but now when I try to take it out of low range the indicator goes off but the truck stays in low range, any advice on finding out the problem?