Install Bay BT305 Brass Battery Side Post Adapter

The Install Bay BT305 is a brass battery side post adapter designed for automotive and marine electrical installations. This single adapter converts a side-post battery terminal, allowing standard ring terminals and cable ends to connect securely to side-post style batteries — commonly found on many GM and other domestic vehicles.

Constructed from solid brass, this adapter provides excellent conductivity and corrosion resistance, ensuring a reliable electrical connection over time. The unique two-piece design retains factory connections while accommodating additional wiring for aftermarket audio, lighting, or accessory installations.

Key Features:

• Solid brass construction for superior conductivity and corrosion resistance
• Unique two-piece design retains factory connections
• Converts side-post battery terminals for use with standard ring terminals
• Ideal for car audio, security, and 12-volt accessory installations
• Sold individually (single adapter)

The Install Bay BT305 is part of Install Bay's comprehensive line of professional-grade installation hardware, trusted by car audio installers and 12-volt technicians. Also available in a 10-pack (BT305-10) for shop or fleet use.