The fuse was not blown but the plastic had melted The Toyota dealer couldn't find anything wrong since the lights started to work after the mechanic played with the fuse. So $80 later I took the car home and found that all it was was the fuse was loose in the fuse holder. The fuse had gotten so hot that it melted the fuse holder and the plastic on the fuse without blowing the fuse. My fuse box has spelt of burning and is getting hot and melt Dec 02, 2009My fuse box has spelt of burning and is getting hot and melt. Discussion in 'Electrics UK' started by sprior149, 2 Dec 2009. For the last few weeks we have noticed a burning smell in the room where the fuse box is. The house is ten years old. Today the burning smell was bad and on closer inspection one area of the box was very hot and had melted.