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On a 7.3, cylinders 1,3,5,7 are on the right (passenger) bank, and 2,4,6,8 are on the left ( driver's) bank.
the reason I am pointing at the harnesses, is the odds of two cylinders per bank, failing exactly the same way, at the same time, well, its pretty astronomical.
The High side open on bank 2 points directly at the harness. At the main connector either outside, or just inside the valve cover gasket.
Those numbers for the resistance are decent, however, you could have an intermittent problem, caused by heat, or vibration.
Check it out, and let me know what you find.