Sterling Power APD12 – 12V Alternator Protection Device

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The Sterling Power APD12 protects your alternator from the damaging voltage spikes (load dump) that occur when a battery or a battery-to-battery charger is suddenly disconnected wh ile the alternator is under load. It clamps those transients before they can reach your alternator's diodes and regulator — cheap insurance for an expensive component in any dual-battery or DC-DC install. Specifications Type Alternator protection device (transient / load-dump suppression) Nominal voltage 12V Function Clamps voltage spikes caused by sudden battery or charger disconnection Typical use Dual-battery, DC-DC, and battery-to-battery charging systems Dimensions & clamp rating Available on the datasheet — contact us to confirm Warranty 2-year return-to-factory Why It Matters Alternators hate having their load pulled away suddenly. If a battery isolator opens or a charger drops offline mid-charge, the resulting spike can destroy diodes and regulators. The APD12 gives that energy somewhere safe to go, protecting the alternator across the life of your build. Show more