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Message: <blockquote data-quote="Still Afloat" data-source="post: 497893" data-attributes="member: 32426">Fast acting fuses are common for electronics.  I would recommend that you do two things:1. Leave the fast acting fuse inline (or put it back in).2. Read the specifications and size the blade fuse at the power supply at about 140% of the maximum current draw.  I’m guessing a 2 amp fuse if the Garmin is the only thing on that circuit. A five amp should be fine too (Assuming the wire gauge will accommodate that current.) since the blade fuse is really just protecting for short circuits in the wiring to the fish finder.</blockquote>