88 Montero, 5-speed

Interesting combination here...

My left rear turn signal/brake light unit isn't working. However, the bulbs in that unit do work when I engage the hazard switch. I've swapped out the turn signal flasher. I've tested the unit with new bulbs. All fuses look good. Both turn signal indicators on the dash work fine. And I've swapped out the hazard switch (although the brake lights don't go through the hazard switch). No change. All the lights that did work before (both front and right rear) still work, but that left rear unit only works with the hazard switch.

Ah, but before you say it's the black wire, sportsfans, the tail lights (running lights) do work on both sides (tail lights use that same black wire for ground). Also, the backup lights do work on both sides (although I haven't found them on the wiring diagram).

And it can't be that the GL wire is open, because the hazards use the same wire (hazards work).

I haven't yet thrown a meter on it because I'm tied up taking care of some other things, but I'll be shootin' wires this afternoon or evening.

Any thoughts or suggestions?