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Why would the right turn signal work but left will not when all bulbs are good and working on a 1974 corvette?

Here are few possible reasons:

Headlight Switch and Relay

Bad Hazard Switch

If your turn signals work occasionally or work in one position and not the other, the culprit is usually the Turn Signal Switch.

Broken Wiring on Turn Signal Lever

Check for loose or broken wiring on the turn signal stalk assembly under the steering wheel shroud