Everythings fine till the lights go on.

Hello all. It's been a while since I logged on and I have completed a lot with all your help and advice in the pages. Thank you. I am nearing the end of the build, but have a wiring question. All the lights and turn signals are fine, until I turn on the Head light. The running lights headlights are fine, but then I turn on the turn signal and everything goes nuts. Flashing, going off, etc. Any ideas? I have double checked the wiring adn seems fine. I have a Signal Stat 900 installed, as the 74 didn't come with turn signals.

 

Sounds like you are having a back-feed some where in your park/turn or tail/stop/turn lights themselves. Just one bad ground on any one of these lights will cause this.