I have a wiring problem right now on my tandem axle car hauler. I'm doing the wiring job myself. My question is does the dual filament light share one filament for turn signal and brake while other filament is used for running light? Because thats the way I have it wired. I'm assuming the tow vehicle will control the brake light and turn signal. The problem right now is both right and left running lights are working, so are the brake lights. But when I try the turn signals only the lift side works. The crazy part is when I disconnect the left side and power up the right side the left side still works???? Some how power is back feeding to the left side while disconnected and still getting power. Does anybody know what is causing this. I'm thinking a turnsignal is shorting to ground.... maybe.... or the light assembly is junk on the right side. Any help would be great, Thanks in advance.