I made my own manual shifter, but it's still electric. I cut the wires at the motor, and made sure it worked by hooking it to a battery charger. Swap the polarity of the wires, the motor goes one way, and then the other when the wires are swapped. Bolted it back onto the transfer case.
Then I took the two transfer case motor wires and extended them up to the driver' side inner fender under the hood. I took another cable with 4 wires in it, and ran that from the same area into the cabin to a switch under the dash. I used this switch which is already setup to polarity swap a dc motor.
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Two power wires go to the two outside terminals, two motor wires go to the middle terminals.
Out under the hood I tied the power and ground directly to battery power with a fuse. Connected the motor wires from the switch to the motor wires coming from the transfer case.
The hook-up is done. Now all you need to do is figure out which direction the motor is going with the switch. With this setup you are sending 12v directly to the motor, so it moves fairly fast. So all you need to do is just bump the switch when moving it. Find a slippery hill, put it in reverse, if you are still in 2wd it should spin. Then bump the switch one direction. Make sure there is no pressure on the driveline. If you need to inch forward slightly do so, this is no different from getting a manual shift transfer case to shift. If nothing happens bump the switch the other way. You should be able to feel it engaging the transfer case.
Once I figured out which way the switch was working, I wanted 2wd to be up, 4x4 to be down. So I swapped the motor wires under the hood at my connection to make that happen. I then put a large "2" on the top and the large "4" on the bottom of the switch.
To help me later, I went to the shift computer, mine was under the dash panel on the pass side beside the speaker. I had the factory manual, and I had left all those other wires still hooked to the motor. There are wires from the computer to the console lights for 4 hi and low range, and there are switches inside the motor that tell the computer what position the motor is in. I found the 12v feed for the computer and cut it. I then found the common to the switches in the motor and cut it and tied it to the 12v. I then found the wires for 4 hi and 4 low from the motor and cut them, and found the wires to the console lights and cut them, and connected the switch wires directly to the proper lights.
Then when I moved my switch, the lights in the console would light up and tell me what mode I was in. I used this for years, it was still working when I took it off the road about 6 months ago. I converted a co-workers Bronco II the same way, and he loved it and I assume it is still working also.