Right turn signal blinker circuit?

Thanks, Joe. I'll do that check ASAP.

1. The "flasher" switch is labeled "A" on the fourth image, counting from left.
2. Because the left turn signal flasher function is okay, yet the right turn signal flasher is not working, and both connect to the same switch, what is the actual point of failure? Does the switch circuit have a left and right arm?
3. Duly noted-- the hazard flasher is "B" on the same schematic image.

*Thanks for the schematic, and the highlighted areas.

Joe,
At long last, after the non-crank episode, I can return to resolution of the right flasher problem. As you commented earlier in this thread, "Since the lights are turning on but not flashing, we know the switch is good. I suspect the issue is with the flasher itself. ".
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As you instructed, I found the flasher-- which seems a good place to resume diagnosis.
Tomorrow, I'll check the flasher for vibration when L or R turn is selected.
According to a brief review of the schematic you provided (thank you!), I located the R turn switch, and traced the rest of the circuit.

Here is current symptoms--
1. Both front and rear side marker lights work.
2. Front side marker and L tail light work when turn selector on steering column is switched to L position.
3. Front side market and R tail light do not work when turn selector on steering column is switched to R turn position.
4. Instrument panel shows a continuously lighted R turn green indicator, which does not flash and stays lighted no matter where the turn selector has been switched.

Joe,
As I understood it, the flasher issue is different than the starter enables relay location. Please correct, if I misunderstood you.
At this time, the Buick's non-crank situation has been resolved-- one of the 10A Minifuses had been slightly bent on both prongs, so it could not be inserted properly, and eventually became loose enough to fall out of the Minifuse panel. Although I still would like to find the starter enable relay location with an orienting photograph, that seems different than the inoperative R turn flasher.

I found the rounded flasher "pot" for the turn signals with no problem, but the starter enable relay still eludes me. Still am looking for a photo of the general starter enable relay area, so I will be prepared if a non-crank ever recurs.
BTW, Thanks for the line drawings.

Joe, When I looked under the dash (with the lower cover removed), I did not see anything which matched the replacement starter enable relay purchased through the manager of a local (O'Reilly) auto parts store.
This is simply a note to keep you posted. If I run across the relay, of course, I'll let you know.