And...

White wires are running lights... all.
Red is brake in the rear, but simply illum lights in the dash cluster.
Black is ground in the front lights
Gray is reverse in the rear
Green is left turn signal and blue is right turn signal...all.

Sometimes they'll make a break at the plastic connectors after all these years, good to check those as well. One at the left front corner of the engine bay. One right at the corner of the dash (left side of course). And a couple right at the rear lights, each side.
My experience is the bad connection is always at one end or another, never in the middle. Do not be tempted to cut your black harness cover (unless it's melted:o).