Ok so ive changed the actuator on my jimmy and nothing. I press the button and it drops in 4 low but its like the wheels don't lock, Ive been reading about these switches on the fire wall but i have yet to find mine. anyways whats going on is that ill put it in neutral and put it in four low and it will light up like its in four low but when i put it back in drive its like its back in two wheel drive, the other day i got it to engaged for a minute but then i stopped and nothing happened again. can anyone help?