Neither did I. What I did was take one of those current testers and found the right wire behind the headlight assembly. I ran it to the point in the switch that would trigger the relay and now the foglights come on only when the lights are in highbeam mode, or "off" (Canadian daytime running lights send a current to that line).

I know that's not "legal" but holy shit does the truck ever throw off a lot of light now.