When I shift from 2-H to 4-H, No problem, light comes on. Shift to 4-L and the Low light doesn't come on, but I'm in low. Then When I shift back into 2-H the 4X4 light stays on. My truck has the manual transfer case lever on the floor so I know I'm in 2WD or 4WD, but the light wont go off. What do you guys think the problem is?