The Stovebolt Site Forums The Shop Area The Electrical Bay Tail Lights - 1954 Chevy Truck

sound like a bad switch

but I'm not familiar with the 54 single bulb set up.

hopefully someone else with have a better Idea for you

here is the tech tip
http://www.stovebolt.com/techtips/turn_signal.htm

your doing a good job with the trouble shooting.