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You seem to have eliminated most of the components in the system, John, so there aren't many potential culprits left.
As the hi-beam won't work in either its steady or pass state, try checking the earth from the bulb. The connector will have a yellow/black (power) wire and a black wire, which is the earth. At the same time check you've got power in the yellow/black wire when the switch is energized.
If there's no power to the yellow/black wire, the problem could be the switch itself. Open it up, clean the contacts and check for power on the appropriate terminals.
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