Newmar 1-3-70 Battery Isolator

The Newmar 1-3-70 Battery Isolator is a heavy-duty charging controller engineered for vehicles with dual battery systems or multi-alternator setups. Whether you're running auxiliary batteries for off-road winches, camping gear, or commercial fleet operations, this isolator automatically manages charge distribution without manual intervention. It's the professional solution for anyone tired of dead secondary batteries or worried about one battery draining power from another during vehicle downtime.

Built for reliability, the Newmar 1-3-70 uses intelligent load-sensing technology to charge each battery according to its individual charging needs, eliminating the risk of overcharging or sulfation. The isolator prevents reverse current—the silent killer that discharges a primary battery into a dead auxiliary battery while the engine is off. Its solid-state design operates silently with no moving parts, relay chatter, or solenoid clicks, making it ideal for stealth camps and quiet installations. At just 1 lb, it integrates cleanly into engine bays or distribution boxes without adding significant weight or complexity to your electrical system.

This isolator is essential for diesel truck builds, expedition vehicles, mobile workshops, RV conversions, and commercial service trucks where multiple batteries must work independently. It's equally valuable for marine applications, emergency response units, and any vehicle where auxiliary battery failure could strand you. Installation is straightforward for mechanics and serious DIYers—simply wire it between your alternator output and secondary battery bank, and the unit handles voltage sensing and charging logic automatically. The Newmar 1-3-70 integrates seamlessly with both single and dual alternator systems, making it the single most reliable way to protect your electrical independence.