what i did for my 88 fog lights was to look on the BACKside of the fuse
box ... there are several not-used spade lugs. by testing with a meter,
i found a couple kinda in the middle that were hot when the parking light
switch was on (which is what i wanted) i ran a biggish wire off that lug
to the fog light relays.

i wired my relays to be "triggered" by the parking lights (just tapped into
the power wire to the right front parking light. watch out, cause one of
those wires is the turn signal wire). that way, i can swith OFF my headlights
(leaving the parking/running lights ON) and use only my fog lights for
forward illumination ... works MUCH better in snow and heavy rain (cause the
snow/rain can reflect the regular headlights back into your eyes). yes, it IS
illegal in some (most?) states, so it might not be a good idea to do it
on major highways. :)  but it works for me ... and a lot better than having
the headlights on, too.

and i HIGHLY recommend getting another set of fog lights, and putting ONE
of them on the rear bumper (with a switch up on the dash) to use as a
"backup" light. at night, it is SOOOOO much better ... you can actually SEE
where you are going. if you are camping in the woods, this is really really
a good thing to do.

and what do you do with that left-over single foglight?? save it for a "spare"
or sell it to some other camper/bus driver. :)

good luck.
joel