Turn signal problem

On my 71 road runner, the signals work fine when engaged, however after a period of time the right signal gradually starts glowing...not full brightness, but close. All right side signals glow including the dash. I can use the signal without issue but the glowing lamp comes back quicker, it seems, as the car gets warmer??
Any thoughts?

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Any thoughts?

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First I'd replace the flasher can, the one for the turn signals not the one for the hazard flashers. Get an electronic one & the replacement ones sold these days may be mostly electronic but check on that.