Quote Originally Posted by LittleBeast View Post
Yeah I found the diagram from Moncha to be wrong as well, but it is just a flip flop of the + and - I forget I have the diagram somewhere and I will pull it out soon because it looks like I need to redo the wiring again for the 3rd time to get this right.

My problem is the HID in the fog lights will not ignite if the engine is running. If the engine is off then both lights will ignite and stay on and you can then start the engine up and be fine (all lights stay on) however if you start the engine first and then try to turn the HID fog lights on then only the left light will ignite and stay lit, the right one might "try" to ignite momentarily but looks like it never gets enough juice to fully light.

So should I buy another relay and hook up one relay per light?

Or should I redo the ground wire to go to the frame instead of back to the negative battery terminal?

Or should I make both + wires 10gauge and the same length from the 1 relay and make the - ground 10ga as well? What do you think?
HIDs do not draw much current at all, hence the fact that the factory HID wiring is fairly small (14 or 16ga). One relay would be plenty, those things are rated to 30amps. It sounds like you have some switch issues. It makes no sense that it would work with the truck off and not when its running. What are you using for the power supply to the coil in the relay? Is the relay hooked directly to battery? You should never ground directly to battery, I would move that to the frame. I think its a power to the relay problem at the switch, or you could have a bad ballast, and the vibration of the truck running is enough to prevent enough current for the inductive kick to "ignite" the bulb. That is easy to check, just swap ballasts between the two lights, if the same ballast has the same problem, voila, problem solved, if not, it tends to lead to the ground connection or the switch.