Re: 69 parking lamp issue
Progress!! You've narrowed it down to the brown wire in the socket housing/pigtail. The harness is good.
I would clean the contacs on both sides of the connector plug, and clean the 2 nubbon contacts and the inside wall of the bulb socket.(sandpaper, wire brush, etc.) It's possible but unlikely that the brown wire is broken between the lamp housing and the plug. It's easy enough to remove the lamp housing and the pigtail to inspect it carefully.
PS The plug connector isn't the greatest design in the world - sometimes just fiddling/jiggling around with them a bit will cure the problem.
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