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Yes. That is it. Use a chisel and a hammer to loosen it. Best to check it for a corroded pin. The neutral safety switch runs thru that connector. Add stabilant 22 or dielectric grease to all pins

Only requires the single power wire. And your exciter wire is not being used. Which means the alternator does not require a signal to operate. It produces power anytime it spins.

If you do not have one. Invest in a power probe circuit tester. They have power probe 4s on ebay for $209 shipped for new ones.

You have a brushless alternator. Run a wire from the alternator directly to the battery. Eliminating it from the pcb system. The exciter wire that inhibits starting while the truck is running is not hooked up so that has nothing to do with your issues of not starting. I am going with the...

Please post a picture of your alternator. If it is a brushless unit then you should direct wire it to the battery and the exciter wire should not even be hooked up to cause any issue for you.

Wire #5 is that. Usually If the alternator is working fine then that is not the issue. Exciter wire tends to freak out and blow the pcb. Stick your test light in wire #5 plug with the pcb hooked up and see if you have power there when it is causing an issue. Not likely but possible ...

You know that the control box in the picture you posted is made for a Non abs truck right? Answer this. When the truck will not start. When you flip the power switch up, do the gauges twitch or go back to their operating ranges like your coolant, trans temp or fuel? If No replace the pcb...