Will probably have more luck in the JK forum. The only foglights YJ's have on them are owner installed so it would just depend on how the owner has the wired.
What is the point of having high beams and fog lights on at the same time? High beams point higher up than low beams, allowing the light to be projected farther, this also causes fog to be harder to see though since the light is aimed higher. Fog lights have a very low cut off and very wide pattern and only project light 10 or so feet in front of the vehicle, this is so they do not reflect off of the fog and make it hard to see though.
High beams are detrimental to use in fog and fog lights are of no use at any speed requiring high beams.
˙ɹǝʌo ɹǝʇndɯoɔ ɹnoʎ dılɟ sıɥʇ pɐǝɹ uɐɔ noʎ ɟı