Summertime Signals
 

Ok...here's one for the motorheads to ponder. A few years back, I picked up a 77 Chevy pick-up. A true beater, to be sure, but I like it. For one thing, I can fix almost anything that breaks on it. Note that I said almost. Here's one that has me baffled. My right hand turn signal only operates when it's above 50 degrees (F), outside air tempetature. Over 50, it works fine...each and every time. Below 50, it doesn't work...at all. Left signal works fine in all temperatures. So basically...my right turn signal is useless in the wintertime.
Now, I'm sure it's cause and effect. Meaning that the temperature is not affecting my turn signal, but is affecting something, that is affecting something, that is affecting my turn signal. Any thoughts?

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.

Never heard of that before, but check what lt1s10 said to do, then if thats not the problem check your relay!