Sierra 18-6855 Battery Isolator 1-Alternator 2-Batteries 75 Amp

The Sierra 18-6855 battery isolator enables simultaneous charging of two separate battery banks from a single alternator source, making it ideal for marine vessels, RVs, and commercial vehicles that require both a starting battery and an auxiliary house battery system. This 75-amp rated isolator ensures that each battery bank charges independently while preventing discharge between batteries when the engine is off.

Key Features:

• 75-amp continuous duty rating for reliable performance
• 1-alternator to 2-battery configuration
• Solid-state diode design prevents battery drain and cross-discharge
• Allows independent charging of starting and auxiliary batteries
• Maintains battery isolation when alternator is not charging
• Durable construction for marine and automotive environments

Important Compatibility Note: This isolator is not compatible with Delco CS-style alternators. Verify your alternator type before installation to ensure proper functionality.

This battery management solution is perfect for boats, RVs, emergency vehicles, and any application requiring separate battery systems for starting and accessory power while maximizing charging efficiency from a single alternator source.