running lights and turn signals

I'm putting together a 1937 plymouth coupe, it didn't come with running lights or turn signals on the front of the car. We made up some LED's lights to use. How do I wire the light so the LED's will light when the running lights are on and flash when the turn signal is on and also flash when the running lights are off. Currently I have three wires in the headlight bucket, ground, left turn, and running. Thanks, Allen

LED's are polarity sensitive so you can't flip the power on them. I looked at doing this with relays, but I couldn't work it out with just two. However it looks like it's doable with diodes. Tie both the parking and turn signal wires to both leads and use diodes to control polarity. So when the parking lights are on, turns off, positive flows from the parking lights to turn signal. When the parking lights are on and the turn signals are on, you have no ground so the leds aren't illuminated. When you have the parking lights off and turn signals on, positive flows from the turn signal to the parking light wire. With both off, there is no positive. Assuming both wires are hot when active.

Great, I'll give it a try today. Thanks, Allen

With the diagram using the relays, two questions- 1) Since I using the normal 1157 rear lights should the standard flasher work? 2) I'm a dummy, on the diagram what is the circle to the upper left with X and L in it? Thanks for all of the help! Allen

oh your not a dummy. i guess i didnt explain good enough. the circle is the flasher. and yes if you have standard bulbs in the back this will work fine with a standard flasher. for some reason i thought you had all LED's.

question: did you install a modern fuse box with new style fuses in it with the built in socket for a flasher like from painless wiring or some other hot rod aftermarket harness company? if so, i can give you another diagram to use that built in flasher.

Yes, by memory it's a ron francis kit. Thanks

I passed on that diagram because you have to catch power between the turn signal switch and the flasher. I'd like to see the other diagram as well.

allen newton wrote: Yes, by memory it's a ron francis kit. Thanks

can you give me the part number of your kit?