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It's ok, I found the problem. (I was using the big wiring diagram out of the -20) This is an M813. Some jackwagon swapped 91 and 17 on back of the DRIVER's headlight bucket. Apparently someone was clever and figured out that if you swap the same wires inside the PASSENGER bucket, the lights...

Ok, in addition to the meter I rigged a test light. Something between the headlight buckets and the hi/low switch is definitely wrong. It may be the switch. With both headlights removed, using the test light on one bucket at a time: - In "low" the passenger low beam (#18) lights the test...

Wait, according to the diagram that's not correct. It's either/or not "both." Maybe I've found the problem. Let me run out and check again.

With power OFF, I have turned the combo switch to "service drive" and activated the high beam foot switch. There is continuity between all three pins in the headlight bucket. That seems correct to me because I think both beams are on when in "high beam." ...aren't they?

This problem involves the OEM incandescent bulbs. I am NOT running LED's anywhere in this truck except for the gauge illuminators. I observed my passenger headlight low beam not working. I grabbed a spare headlight bulb and it promptly smoked the low beam again. Ok, the passenger low beam...