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Great news. Good job!!! The CUCVs are really very simple machines once you understand them. Here we are many mile from you and with just a few pictures we where able to get the truck up and running.

There is a great set-by-step testing procedure in the TM 9-2320-289-20 tech manual

If the card is missing, you can install a manual switch. Very easy to do. The GP relay is hot when the key is on. All you need is is to provide a ground. That is what the GP controller card does. It provides a ground to the relay when needed. The small blue wire is the ground wire for the...

Have you checked to see if the GP controller card is installed? Since everything else was removed they may have grabbed the card also.

Now the only thing on your truck that is 24v is your starter and the GEN2 alternator wiring. There rest of the electrical wiring is standard 12v stuff. To your questions in post #15 1 - On a stock system the 12v power for the entire truck comes off the battery connector of the rear battery...

I just noticed that the 12v feed wire for the entire truck is also missing. We will need to start from scratch and take it one step at a time.

Before hooking up the batteries lets make sure ALL the wiring is where it should be. I'll post some diagrams to help out. We will need some additional picture of you battery cables and the 24v buss bar behind the rear battery

Along with the supply wire for the GP relay.