Dear Pickles. Got a different but similar problem to yours. I understand you had a problem with fog lights not being controlled normally and solved it by attacking the fuse box. I have a problem with a horn that won't turn off. Only control is the fuse in the underhood fuse box, pulling the instrument panel fuse or the horn relay has no effect on my blasting horn. From my understanding of the horn circuitry I end up back as a short somewhere. Can't really justify checking all of the wiring back from the horn looking for shorts to ground because that does not make sense, the wire would not just have to be bare but it would have to be touching the frame... So what did you find taking the box apart. It is freezing and below here in Northern Canada so I don't really want to pull apart a perfectly good car without having some idea what I am doing and screwing stuff up worse than it is now, Was it simply a plug that was partly dislocated or vibrated loose enough water was shorting it to ground. or was it some chafed wiring? Rocky