1966 chevy turn signal does not work

It's likely that moisture intrusion over time has corroded the socket and/or the base of the bulb causing an intermittent open circuit.

Clean the socket with a small tubular shaped wire brush* and compressed air. Install a new bulb.

*The wire brush used to clean the inside of a 1/2" copper tube fittings prior to soldering. Hardware & Home Improvement stores have them.

It seems to be a ground defect on right side. Do you have the same bulb's number . What about the front flasher. remove right rear lamp assembly remove connector measure voltage between ground and current .reconnect it measure voltage at bulb socket. you should find your problems
hope it helps

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could be something in the turn signal switch

you are describing a typical turn signal switch problem, all those systems run through this switch, its about a 110 dollar part

There should be two flasher controls in your fuse box, one for the hazards and one for the blinkers. If replacing the flasher does not work, a bad ground at the signals can cause this problem.

sounds like you have a bad flasher which is usually located near the steering column under the dash. check for ground on front left bulb. may have to replace light socket if ground is good.please leave comment.

Check the connectors on the head lights . check the dimmer switch on the floor, check the turn signal bulb sockets and make sure that they are well grounded.

A "straight 6" is NOT a "V6"...whatcha really got?
There couldn't be a more simple car in the world to work on...If you have experience with carbs got ahead and check her out...unfortunately, if you DON'T...just take it to an OLD mechanic, not some kid, and have em look at it...Couldn't be more than $25 and WATCH HIM as he''s doing it.
My hunch is it's the choke assmbly.
Good Luck...you have the BEST engine in the world!!

replace gear box the valve stuck in one direction auto parts still carry tho its a reman around 150