My 4x4 High will not engage, 4L will. I can actually hear it engaging and the light stays on. When I put it to 4H I can hear clicking in the dash but nothing. I purchased a new transfer case motor. Here is what i found out.

1) there was a black wire coming out of the transfer case, I'm guassing a ground wire? I just cut it since the new motor has an extra pin in it in the same location. Other than that all the pins were the same and everything bolted up nicely. Since i drive this daily, will that black wire need to be hooked up or can I just secure it and tape it off? I wasn't sure what it controlled but looked to be a ground. (found out I actually need this for the coil in the transfer case, can I just tape one of the wires on the new motor? the new motor did not have a wire like it.)

2)same thing NO 4H but 4L will work.

3) I took the new motor off and had someone put it in the 2H and 4H and 4L, the motor moved on all the parts except 4H. It didn't move at all. Like the motor was not getting any power to move it to 4H.

so am I looking at an electrical issue ? What's next to check?

Since I can move it to 4L, I wouldn't think a fuse, I checked the fuses that I would think controls those, but I'm open to all suggestion. It's really weird and I'd like to get this fixed.

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This is on a 97F150 EC. XLT 4x4 Automatic, has about 108k miles on it.