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Depending on distances, wire routing, seat construction etc I personally might skip the fuses. But that really means playing the odds. I'd at least add some extra isolation. heat shrink tubing, rubber sheets/mats, plastic panels...

Heh, a friend of mine skipped isolation. Then a very, errr, well-fed friend sat in the back. The seat sagged, a steel spring shorted the battery, seat filling (looked like some kind of impregnated staw) cought fire. Splendid time was had by all. Luckily, nobody got injured, except the beatle. (Incidentally, in the same family - they like strange cars - an incident of an incinerated NSU Prinz happened; this time it was fuel spilling from the carburetor...)

Take care!