The primary job of the Subaru Legacy Fuse is to stop excess current before it harms radios, headlights or dashboard gadgets. Housed in a plastic box under the hood or tucked beneath the dash, the Fuse teams with compact relays that route battery and alternator power, melting quickly during a surge and cutting the circuit. Two main styles exist, the older glass tube and the now common blade design that many Legacy drivers see, early Legacy cars paired with the glass tube whereas later Subaru versions rely on the blade Fuse, and both aim to guard relays from engine bay heat, vibration and moisture. Blade pieces slip in as low-profile mini, mini, regular or maxi sizes, each bright color showing its amp rating, while glass tubes share one diameter but come in assorted ratings. A fast test light check reveals a blown Fuse when only one side lights, and swapping takes seconds with the puller stored in the panel. Because a replacement is affordable, stashing a spare Fuse keeps any Subaru journey moving when a GPS, charger or horn suddenly quits.
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