Down4Sound D4S-BIS500 | 500 Amp Battery Isolator

D4S-BIS500 500 Amp Battery Isolator and High Current Starter Relay

The D4S-BIS500 is a heavy-duty 500 amp battery isolator and high current starter relay built for serious car audio systems, dual battery setups, and high-demand electrical applications. It helps protect your starting battery while allowing your auxiliary battery to power amplifiers, accessories, and other aftermarket equipment with confidence.

If you are running a high-power system and need better battery management, the D4S-BIS500 gives you a dependable solution for isolating power and improving overall electrical system performance.

Key Features

• 500 amp high current capacity for demanding mobile audio and power applications
• Battery isolation helps protect your starting battery from excessive drain
• High current starter relay design for strong and reliable performance
• Ideal for dual battery setups, car audio systems, and auxiliary power management
• Built for dependable operation in performance and custom vehicle electrical systems
• Clean and simple solution for managing multiple batteries in one vehicle

Why Choose the D4S-BIS500

In high-performance car audio builds, proper battery isolation is critical. The D4S-BIS500 helps separate your primary and secondary batteries so your system can deliver power where it is needed without compromising starting reliability. Whether you are running multiple amplifiers, an auxiliary battery bank, or added electrical accessories, this isolator is designed to support stable and efficient power distribution.

Ideal For

• Dual battery car audio systems
• High-power amplifier installations
• Vehicles with auxiliary batteries
• Custom electrical and performance builds
• Mobile audio applications requiring battery protection and power control

Product Information

• Model: D4S-BIS500
• Product Type: Battery Isolator and High Current Starter Relay
• Current Rating: 500 Amps
• Packaging: White box packing

Upgrade your vehicle’s power system with the D4S-BIS500 500 amp battery isolator and enjoy better battery protection, cleaner power management, and dependable performance for your mobile audio setup.