One year old Porsche Cayenne Turbo($265000NZD here), had a radar detector fitted to it and guy was changing cars and wanted it transferred. I traced the wiring back to the fuse box for it's switched live.

Dodgy cunt had soldered the wire to the top of a blade fuse in the fuse box, to make matters worse he must have soldered to the outlet side of fuse and I can only assume he blew a couple as it should have been a 10A fuse in that slot and had a 30A......