No crank no start?

The dark green wire is power coming through the PNP switch, if you're missing power there go to the pink wire on the Park Neutral switch and check for power there, make sure the key is on.
It should look like this. It's the pink wire on a number of different transmissions.

The pink wire is the 12-volt power feed, and it comes out the switch on the dark green wire labelled G. There are actually 2 pink wires I see now; one is labelled E and one is labelled C. You want to check the wires labelled E and G. The pink wire labelled E is highlighted in blue on the connector diagram. And 12volts should be coming out on the Dark Green wire. I didn't realize there were 2 Pink wires both labelled Ignition 1 voltage.

If 12-volts are there, verify its coming back out on the dark green wire. Were you missing both 12-volt feeds at the relay?

You have to check that power is going through the switch, it should be going in on the pink wire and coming out on the dark green wire. Thats how the circuit works, if the vehicle is not in Park or Neutral, there will be no power coming out on the dark green wire. If it is in Park or Neutral 12-volts will be coming out on the dark green wire. The dark green wire goes to the Starter Relay.

As long as the key was "on", it's not a short, it's an open circuit. You can try putting the vehicle in Neutral to and run the same test, but yes there should be power coming out on the dark green wire going to the Starter Relay. Make sure the Park Neutral switch connector is not corroded or anything, but it sounds like you have found the issue. Try moving the shifter from Park to Neutral and back to Park just to verify that it's not something in the linkage going to the PNP switch. Sometimes the linkage wears and the switch does get moved all the way into Park. The linkage to the switch should be tight.
The new switch should come with a small alignment bracket, (Positive Assurance Bracket) to make sure the switch goes on correctly, there is an alignment tool J41364 A that is used if the switch is taken off for other reasons, but a new one should come with it aligned.

Read my last post. There's info on aligning the new switch.

Yes, here's the instructions for replacing the switch. There are 2 different transmissions for this truck, but it's the same when replacing the Park Neutral switch. Just put some blocks under the wheels to prevent it from rolling while doing the repair.

Awesome, good news, glad you got it going. Have a good day.