On my 95 there were two relays infront of the airbox. One relay is for the foglights, and the other relay...although it clicks when you activate the highbeams, they still work without it. Regardless, we'll call this the "relay that just clicks when you turn the highbeams on."
Anyway there was a blue wire connecting these relays.
I simply cut the wire and wrapped electrical tape around each wire's end to keep it waterproof.
That was the wire which turned the fogs off when the highbeams were activated.