I have a 1955 Ford with 6 Volt system.  With the head light or parking lights on when I use the turn signal, for example signal for a right or left turn the tail lights will flash for the right or left turn but also the opposite tail light will also flash but very, very lightly but it does show up at night.  When the head lights or parking lights are off there is no flashing of the opposite tail light.  Is this normal or do I have a wiring problem?  John

JDH: 1955 Ford car, I have switched from 6 volts to 12 volts. Every thing working on 12 volts except now I have no brake lights, no turn signals. I have 12 volts at the brake cylinder. Where have I gone wrong? Turn signals worked on right hand side of car for a short time but quit.