Fuses and Relays

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Fuse and Relay Fitment and Compatibility

Fuses match by amperage and by physical format, and both matter: a mini blade fuse and a standard blade fuse of the same rating will not fit each other's socket. Common replacements include the 15A mini fuse replacing OEM 6707621, the 25A mini fuse replacing OEM 6707623, the 20 amp fuse replacing OEM 6625575, the 30A engine fuse replacing OEM 6718034, the 50 amp fuse replacing OEM 7521225, the 60A fuse replacing OEM 6694397, the fuse replacing OEM 6803264, the fuse blocks replacing OEM 7023168 and 6665356, the fuse cover replacing OEM 6665358, and the relays replacing OEM 6679820 and 7269280.

Fit the amperage the machine specifies and nothing higher. A fuse protects the wiring, not the component on the end of it, and its rating is set by what the wire in that circuit can carry safely. Fitting a larger fuse to stop it blowing removes that protection and leaves the wire itself as the weakest point in the circuit, which is a far more serious failure than the one being avoided.

Types of Replacement Fuses and Relays

Blade and mini fuses protect individual circuits and are the most commonly replaced electrical part on any machine. Higher-rated fuses protect main feeds and charging circuits.

Fuse blocks and covers hold and protect the fuses themselves. A cracked or missing cover lets moisture and dust into the block, and corrosion there produces intermittent faults across several circuits at once, which is far harder to diagnose than a single blown fuse.

Relays let a low-current switch control a high-current circuit, which is how a small dash switch runs lights, a blower, or a starter circuit. A relay that clicks but produces no output has usually failed at its internal contacts rather than its coil.

Treat a fuse that blows repeatedly as information rather than a defective part. It is reporting a fault in the circuit it protects, and the fault is usually a chafed wire somewhere the harness moves or passes through metal.

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