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I'd check with Eastern Surplus or a few of the other places that sell HMMWV parts... but, as much as I choke at the thought of $1,000 harness, it doesn't really surprise me. Supply and demand...
The -20 TM should have a wiring diagram, but in all honesty, I'd just try to find a replacement harness.
I think the additional wires you are finding are for the blackout system. If all these have been cut, to include the connector to the light switch (which also includes dash lighting)...