I would venture to guess that by tapping into the head light wire, adding a diode, then tapping into the fog light wire, adding a diode, and hooking the two togther would do what you want. Anytime the headlights are on the fog lights would be on too, whether auto activated or not. Here's the thing I don't understand mr Ford owner, why do you need the fog lights on all the time? It has always been my understanding that Fog lights were only to be used under Foggy conditions... The rest of the time they are an annoyance for other drivers on the road, just like those blue headlights IMO.
some diesel stuff