As some may remember I was having intermittent fuse-blowing on this car (83 300D) when shifting into reverse. A trip through the rear wiring netted nothing, so I disassembled the neutral safety switch. Nothing overtly wrong, but I did think that one of the spring leaves seemed to have a bit much sideways flex in it so I potted its base in Shoe Goo and reinstalled it after it had dried. I had wondered if it could move sideways enough to contact the case.
That seems to have done it, there have been no blown fuses since then. -- Jim