Sierra BS11050 Voltage Sensitive Relay Cable Kit for Dual Battery Installation

The Sierra BS11050 Voltage Sensitive Relay Cable Kit provides everything needed to install and automate a dual battery system in marine applications. This complete kit simplifies the installation of a secondary battery by including a voltage sensitive relay (VSR) that automatically manages charging between your primary and auxiliary batteries.

How It Works:

The VSR monitors voltage levels and automatically connects both batteries during charging, then isolates them when the engine is off. This ensures your starting battery remains charged while allowing your auxiliary battery to power accessories without risk of draining your primary battery.

Complete Kit Includes:

• Voltage Sensitive Relay (Sierra BS11040) with mounting hardware
• 19.5 feet of red battery cable, pre-terminated at both ends
• 2 feet of black battery cable for grounding connections
• 2 positive marine battery terminals and 1 negative marine battery terminal
• Copper crimp lugs for secure cable termination (2 positive, 1 negative)
• Red heat shrink tubing for weatherproof connections
• Insulated blue ring terminal for auxiliary connections
• 6 wire ties for clean cable management
• Detailed instruction manual for step-by-step installation

Ideal for boats requiring dedicated power for electronics, trolling motors, or other accessories without compromising engine starting reliability. All components are marine-grade for durability in harsh saltwater environments.