We make the wires extra long so it fits most cars.
I need to find the schematics for the H4 stock plug. Since the kit is a single filament system, the diode pulls power from the low beam wire on the plug over to the high beam so that the light source stays on while the high beam stalk is pulled. On the stock headlight, the low beam bulb shuts off and the high beam turns on. The high beam wires from the projector will go to the high beam trigger on the stock plug.
You should have just been able to use the halogen harness and run the leads into the ballast if you wanted to bypass the relay. Just make sure you run the correct polarities into the ballast.