Greg;
Good job finding the problem. Even better, getting your lady to help!
Just a note for anyone else that reads this, I believe the "green" wire you are referring to is actually a Green/White wire, i.e. Green body, White Stripe. That GW wire is the main feed to the Park Lamp circuit, Side Markers as well as the Dash Lights.
The "little circuit board" is actually the Headlight Switch itself, and what you were seeing was the connections to it.
As a further diagnosis, your Brake and Turn Signals would have operated normally in the rear, but it was your Park Lights and Side Markers ONLY that didn't function.
FWIW
E
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