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Ground wire, condensation in bulb or socket, insulation on wires tends to get stiffer when it's cold maybe an intermittant contact. If you turn a can of compressed air upside down it'll spray liquid that's pretty cold. Maybe spray down the bulb, socket, and housing to see if anything happens while the signal is on.
I've got a 73 that was my dad's (he bought it brand new). It's a great beater that I don't worry about. I just drive it.
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