Well, this is a little embarrassing
but it's been a while since I've worked on or driven my '40 Ford and I completely forgot about having made some modifications a few years ago to the turn signals, so let me backtrack a little!!
After doing a brief inspection, I found that I had already added an additional socket and bulb using a 6 volt #209 bulb, which burns brightly when connected to a battery charger, but dimly when installed on the car. My question now is, do I need to change to the 6v electronic flasher unit mentioned above to correct the very excited flashing problem? It seems the bulbs don't stay lit long enough to allow them to reach full brightness. Photos below...
Further thoughts????