This sounds like a good time to use a test lamp as it draws current vs an ohm meter that draws no current.
Also, as suggested earlier, i would swap lamp holders from left to right for a quick test (at the three conductor plug). Note; pull the inner panel (6 or screws), unplug the two left hand connectors, then the two 12 mm hex heads at the triple and the fairing is in your hands. You can do a complete inspection of the harness and swap the lamp holders....
Inspecting the inner fairing connections is a value add as you may have lost your ground there.
Also, as suggested earlier, i would swap lamp holders from left to right for a quick test (at the three conductor plug). Note; pull the inner panel (6 or screws), unplug the two left hand connectors, then the two 12 mm hex heads at the triple and the fairing is in your hands. You can do a complete inspection of the harness and swap the lamp holders....
Inspecting the inner fairing connections is a value add as you may have lost your ground there.