No power going to front actuator

Okay. That helps rule a few things out. At this point, we know the shift motor is responding to the switch and changing modes the way it supposed to. The fact that it shifts back and forth between 2 Hi and 4 Hi suggests that the position sensor on the transfer case is most likely working the way it should too.

This brings us back to the front axle disconnect(FAD). You mentioned only having power on one of the wires at the disconnect actuator. Are you measuring this with a volt meter or a test light? There should only be one circuit there with full 12v on it. So if you're using a test light, it's only going to light on that one circuit. Take a look at the attached wiring diagram of the FAD system. Pin 3(dark blue w/red tracer) at the FAD connector should have 12v with the ignition key on. Pin 4(violet w/dark green tracer) is the signal circuit and should have some amount of voltage on it which will change with FAD position(not sure the value as it's not specified in the service manual). Pin 2(violet w/dark blue tracer) is the motor control circuit and should have either power or ground while it's engaging or disengaging.

That being said.... With everything connected, measure the voltage(with a voltmeter) on Pin 2 which turning the shift knob from 2 Hi to 4 Hi. The easiest way to do this is by sticking a paperclip or small pin in the back of the connector to attach your positive lead. Check out the links below for additional information on using a voltmeter and testing circuits.

https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find!

Did you measure any of them while turning the shift knob?

Sorry for the delayed response. At this point you have one of three things occurring in the four wheel drive system.

1. Tcase position sensor not working. This would prevent the TIPM from determining what position it's in which would cause it to not engage the FAD (not likely based on findings above).

2. Internal FAD actuator failure.

3. Wiring issue between the TIPM and the FAD.

To really narrow it down much further from this point, you would need a scan tool that allows you to monitor the position sensors in the TIPM. If you are able to get access to one, you would need to look at t-case position. It should match the position of your shifter knob. If it never changes to 4HI and continually displays "shift in progress" after you've placed the knob in 4HI, that indicates a position sensor failure at the t-case. If it changes state the way it should, I would suspect a failed FAD actuator at that point.

Have you checked checked voltage on Pin 2 of the FAD connector with it plugged in and while shifting from 2Hi to 4Hi? I know you posted a picture of your meter above, but the screen was blank.

Let me know.

Look at the wiring diagrams it shows everything.