We have been restoring my Bro-In-laws 41 Plymouth P12 Special Deluxe.
She runs and stops, but he wanted to add turn signals. He had already purchase one of those universal type signal devices that clamp on steering column. Using the parking brake lights I was able to get those to flash, but I've had no luck with getting the rear lights to work. The running lights work fine, but I have been told I need a 6 volt "dual filament" bulb.( The car has been running on negative ground BTW). The receiver/harness has locations for inline pins and the bulbs I have found do not light up brightly. I have searched everywhere, even tried another harness, but the diameter was too small. Help Please!!