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I think the plugs will be straight forward. The 3 black wires are 12 24 and ground. You can use a multimeter to identify them. They can be extended if they are cut too short.

His is the printed circuit board style. 3126 trucks only used one style board. His trans control is wtec3. The computer is visible in the pic. I think the 3126 only had wtec3 anyways.

So the blue plug goes into the trans computer. I can see it upper left of the pic. I don’t see any cut wires in the pic. Maybe I am missing them. The white plugs go to the bottom of the power panel. The black wires are your 12 24 and ground. I hope there are no batteries in your truck right now...

I have the power panel and have some dash harnesses. Post pics of your dash area.