Ok here's a common problem - at least with the guys I know and it came up again while wanting to set up my '47 to tow with. You've got an old hot rod and want to run an ancient 3 wire turn signal switch. Problem is those were designed for multi bulb tail lights and your hot rod ain't got those. If you're lucky you'll have a twin filament tail light bulb, but this will work (sans parking lights) with a single filament bulb. What I wanted to do was to have the BRAKE LIGHTS also double duty as TURN SIGNALS. Much like some modern (modern as of 40 years ago) stuff works. BTW - I searched the web and found a "kit" that allows this to be done somewhat inexpensively, BUT!!!!!!!! it is a huge compromise as all it does is to DIM your STOP LIGHTS so that your turn signal gets BRIGHTER when used. I suppose that's OK but having nearly been rear ended on more than one occasion I want them rear STOP LIGHTS as bright as possible. I also broke down in the '47 this past summer - no biggie but there weren't any street lights and it was in teh middle of a construction area - Hazzard Lights sure would have been nice. So.....long story short - here's my solution...... it will allow your front marker lights to double as turn signal lights and your STOP LIGHTS will double as TURN SIGNAL lights in combination with your rear RUNNIGN LIGHTS (if you have those). The addition of a single throw double pole switch will also allow you to hook up hazzards - which I left out of the schematic to make it simpler to understand. But once you look at it - it will be obvious how easy that part would be. BTW - my POS sofware at home doesn't allow me to get a "CLEAN" .jpeg to post - so I had to "hot rod" that for a easy solution - snap a pic of my drawing!