Left turn signal issue

Can you help diagnose issue with LT signal operation? Recently started experiencing intermittent loss of directional signal when signalling left only. Right seems to be fine. Replaced CB at fuse panel, but no apparent improvement. Anyone have thoughts?

Probably a bulb. Which one is the question.

Have you ever noticed that holding the directional indicator stalk “just so” makes it work? I’ve seen several GM switches do that when they are on their way out.

Of course if you go a block past where you want to turn, and make three right turns, it has the same effect as turning left. That way you don’t need a left turn signal, unless you’re turning in to a driveway in the middle of a block.

The obvious solution is instead of turning left make 3 rights instead!

What is a CB?