Ok I have looked at hundreds of forums to find my answers and I cannot find it. I have a 1990 chevy Cheyenne automatic converted from a manual. Have no idea why the changed it but hey for some reason they did. Anyways my 4wd worked when I bought it and now it won't engage. The light use to come on in the floor board and everything now nothing when in 4hi or low. I placed my phone on the ground while engulfed and the drive shaft to the front diff is spinning. I have power at the front actuator 14 volts and I took the actuator out plugged it in and when in 4wd the plunged comes out but not really that far. Changed the actuator out for one out of a parts truck same thing. If I push against it it has resistance and stays out. I manually put the end of a screw driver into the diff and the leaver would only move prob half an inch just guessing tho. Put it back in still no lights on the floor board and I have a bunch of snow right now to I put my front tires in deep snow put it in 4wd and only the back is spinng? So it's not engaging but with everything I have tried seems like it should be. Oh and I have no 4wd fuse anywhere the only fuse box I can find is under the dash driver side. Any help would be greatly appreciated. My next step I'm going to do is jack up the front end engage the 4wd and see if the tires move. Any thoughts?