Headlight relays
I agree with Greg. Mount the relays under the battery tray for a clean look, plus you can tap into the high & low beams wires from there. Add a small terminal bridge right from the battery and your good to go. As a matter of fact, that's where I'm going to mount mine. When I do it I'll photograph the sequence for future reference.
BTW: Go with a set of Halogen H-4 headlights while your modifying the system. You won't beleive the difference....:shock: