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4 ways were dealer option in 65.Only have seen 1 with them in 40 years.

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Oh yes is true, forgott that! well whatever, IF EQUIPPED then the other flasher would it be to hazzards

We don't have to think it could be the TS switch, remember you have wires AND socket in the middle of equation.

Try to feed the bulb directly to tail light plug to check for socket or wire to socket... then you can try to feed on kick panel area plug and down the column directly on TS harness.