Axxess LOC-GMH3 GM T-Harness for Factory Audio Upgrades
Upgrade your factory audio system with the Axxess LOC-GMH3, a vehicle-specific T-harness designed for select 2019-up Chevrolet and GMC vehicles equipped with IOS, IOT, or IOU radios and non-amplified factory audio systems. This plug-and-play solution makes it easy to add an aftermarket amplifier, powered subwoofer, or even a complete aftermarket audio system without cutting or splicing factory wiring. By connecting directly behind the factory radio, the LOC-GMH3 helps preserve your vehicle's original wiring while delivering a clean, professional, and completely reversible installation.
The LOC-GMH3 is engineered to provide four channels of speaker-level audio outputs, giving you the flexibility to integrate aftermarket amplifiers while retaining the factory radio. Its innovative design allows installers to add a dedicated subwoofer amplifier while keeping the factory speakers powered, or reconfigure the harness for a complete amplified audio system. Clearly labeled wiring and included harnesses simplify the installation process, making it an excellent solution for both professional installers and experienced DIY enthusiasts.
Designed with OEM-style connectors and input/output quick-connect harnesses, the LOC-GMH3 ensures a secure, factory-quality fit while reducing installation time. The harness also includes 12-volt power with an in-line 10-amp fuse, ground, and a remote turn-on lead, providing the essential connections needed to integrate amplifiers and signal processors quickly and efficiently. It is compatible with Axxess line output converters, most sound processors, and amplifiers with high-level inputs, making it a versatile solution for a wide range of aftermarket audio upgrades.
One of the biggest advantages of the LOC-GMH3 is its ability to preserve your factory wiring. Because no permanent modifications are required, future servicing, vehicle resale, or restoring the vehicle to stock is simple. This clean installation approach helps protect your investment while providing the flexibility to upgrade your audio system whenever you're ready.
Before purchasing, vehicle compatibility should always be verified. The LOC-GMH3 is designed for select 2019-up Chevrolet and GMC vehicles equipped with IOS, IOT, or IOU factory radios and non-amplified audio systems, ensuring proper fitment and dependable performance.
Whether you're installing a powered subwoofer, adding a multi-channel amplifier, or building a complete aftermarket sound system, the Axxess LOC-GMH3 delivers the vehicle-specific fit, plug-and-play convenience, and factory-quality integration needed for a clean, reliable, and professional installation.
Key Features
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Vehicle-specific T-harness for select 2019-up Chevrolet and GMC vehicles with IOS, IOT, or IOU radios
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Plug-and-play installation with no factory wire cutting or splicing
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Designed for non-amplified factory audio systems
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Add a standalone subwoofer or a complete aftermarket audio system
- Four-channel speaker-level audio outputs
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Maintains factory speaker operation when adding a dedicated subwoofer amplifier
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Compatible with Axxess line output converters, most sound processors, and amplifiers with high-level inputs
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Includes 12V power (10A fused), ground, and remote turn-on connections
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OEM-style connectors with quick-connect harnesses for faster installation
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Preserves factory wiring for a clean, reversible installation
