2006 CAT 320 CLU monitor

I recently purchased a 2006 CAT 320CLU with 6700 hrs and it arrived yesterday afternoon. I noticed monitor was not functioning at all but the radio and ac/heat controls were. I had done some searching on this forum for possible fixes. I have a single 12 pin connector going into the back of my monitor with another 2 pin connector at the top of the display. The fuses test good and I have 24vdc at the fuse panel. Trying to figure out which wires I need to test for power on the harness for the monitor. Serial # is CAT0320CEPAC01086. Thanks

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2006 CAT 320 CLU monitor