A friend bought a Leyland 272 tractor a few years ago and asked me to look at the electrics as nothing worked properly.
Every part of the loom seemed to be melted and I was scratching my head wondering what had happened. All was revealed when I opened the fuse box and found someone had replaced all the old-fashioned glass fuses with 1/4" bolts...
Seemed very practical to whoever did it but fortunately not full mains voltage as in my distillery.