<VV> 61 Monza Turn Signal Issues

[Vintage Nick]

'Vair Friends,
I could use some help with an issue that has happened in the past (and repaired by an old school, now retired mechanic), but is present again. My front turn signals will not work on my '61 Monza Coupe, and the issue is preventing me from getting state inspection passed. I have reached out to a club member, and we have done everything but disassemble the steering wheel to get to the turn signal components. Before I do so, I thought I would see more suggestions.
Here is what we have checked:   
   - Rear turn signals, headlights and tail lamps DO WORK.
   - New bulbs in front, correct specification
   - Checked/cleaned connector in trunk from firewall
   - Checked/cleaned connector in engine bay (left harness near battery)
   - The switch on the steering column IS activating.
   - The turn signal indicators on the dash DO WORK.
   - Tested for power to front signals using micrometer - affirmative for passenger side, inconsistent reading for driver's side
Any suggestions and possible fixes? Many thanks in advance.
Scott