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On the fuse box is a red LED which illuminates when a fuse has blown, an earth is not required for this the fuse boxes illuminate when they detect a short circuit. This makes it easy to identify blown fuses and makes for easier problem solving.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.