Front turn signals not working

Thank you both for responding, it has helped me make some level of progress. Here is the current status:

Following Crewchief's question, I pulled the hazard switch and found that I was not getting continuity on the four poles in either switch position, even though I am getting appropriate power through the red wire. I took the switch apart, cleaned and re-greased and put the switch back together, and now have continuity at all four poles when in the on position (for anyone needing to take apart the hazard switch, it's easy, just a spring and a floating copper contact inside).

This morning I reinstalled the switch (tested to make sure I still have power when the switch is on), and now the left side hazards, front and rear, work fine. I still get nothing from the passenger side front.

I tested for power at the bulkhead, and I am of course getting the flashing voltage for the driver's side (3-12V alternating), but am getting only a very weak voltage reading on the passenger side (less than 1v, just enough to show a reading).

To answer RedFish, I replaced the signal flasher one by the glove box. I see the hazard flasher under the column, but it looks the same as the signal one (If it is supposed to be a different one, do you happen to know a part number? I can't find anything in the service manual). There's no harm in replacing it and at least eliminating that potential issue. However, now that the driver's side is working fine, I wonder if it is likely that the flasher unit is bad (that is, would only one side not work because of a faulty unit?)?

Open to suggestions for what to try next...