I tried to go into 4 hi and the lights went out on the 4 wheel buttons. no other light came on.the truck did not make the usual clunking noise it would when engaging 4 wheel. the front wheels don't seem to be locked in. the trans doesn't want to shift but i am certain it is a four wheel issue and not a transmission issue. I changed the actuator and that did not help. I need to get the truck back into 2 wheel drive. however any advice would be helpful.