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I just fixed this today (I actually found the answer by searching).
Do your hazzards blink? If so, your problem is probably your flasher for your turn signals. It is located under the passenger dash (on my '69). It is a little blue can with a capacitor in parallel. Cost about $2 from your local auto parts store.
All the running lights are working, but neither the left nor right signal will "blink"
I agree, 1st to check is turn signal fasher which is separate from hazard. However you can turn on hazard to check blubs as running and turn/hazard/brakes are different filiments insde the blub. :seeya