Locate the amp rating for the accessory you are going to install. This is the amperage the accessory is rated for and it is only safe to use the accessory at or below this rating. Amperage ratings are listed in the accessories manual near the beginning of the installation section.
Fuses are simple in design. Inside a fuse is a soft wire with a specific cross-sectional thickness. This dimension dictates how many amps can be carried before the wire melts. Too many amps and the fuse fails, saving the rest of the circuit from damage.
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