It's been several months since I've used the 4WD but the last time I did, everything was working and I made it through some rough wheeling.
But today, I put it into H4 during a heavy rain and the 4WD light wouldn't come on. I'm not sure if it is engaging but 4Lo seems to be working just from the feel of the gearing and the sound.
I did also notice a small clicking sound on right hand turns, not sure if it is related to the problem.
Any ideas for diagnosing? 3.4, AT with manual transfer lever, ADD