Axxess LOC-GMH4 GM T-Harness for Factory Audio Upgrades
Upgrade your factory sound system without cutting a single wire using the Axxess LOC-GMH4. This vehicle-specific T-harness is designed for select 2019-up Chevrolet and GMC vehicles equipped with the IOR radio and non-amplified factory audio systems, providing a plug-and-play solution for adding an aftermarket amplifier, powered subwoofer, or even a complete aftermarket audio system. By connecting directly to the factory radio, the LOC-GMH4 eliminates the need to cut or splice factory wiring, making installation faster, cleaner, and completely reversible.
The LOC-GMH4 provides four channels of speaker-level audio outputs, giving you the flexibility to integrate aftermarket amplifiers while retaining your factory head unit. Whether you're looking to enhance low-frequency performance with a powered subwoofer or improve overall sound quality with a full amplifier installation, this harness delivers a reliable connection that simplifies the installation process. It is also 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 audio upgrades.
Designed with OEM-style connectors and input/output quick-connect harnesses, the LOC-GMH4 ensures a secure, factory-quality fit while reducing installation time. It also provides convenient access to constant 12-volt power, ground, and remote turn-on leads, helping simplify the connection of amplifiers and signal processors for a more efficient installation.
One of the greatest benefits of the LOC-GMH4 is its ability to preserve your vehicle's factory wiring. Because no permanent modifications are required, future servicing, vehicle resale, or returning the audio system to its original configuration is simple. This makes it an excellent choice for anyone seeking a professional, reversible audio upgrade while maintaining factory reliability.
Before purchasing, vehicle compatibility should always be verified. The LOC-GMH4 is engineered for select 2019-up Chevrolet and GMC vehicles equipped with the IOR factory radio and non-amplified audio systems, ensuring proper fitment and dependable performance.
Whether you're adding a dedicated amplifier, installing a powered subwoofer, or building a complete aftermarket sound system, the Axxess LOC-GMH4 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 the IOR radio
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Plug-and-play installation with no factory wire cutting or splicing
- Designed for non-amplified factory audio systems
- Four-channel speaker-level audio outputs
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Compatible with aftermarket amplifiers, powered subwoofers, and complete audio system upgrades
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Works with Axxess line output converters, most sound processors, and amplifiers with high-level inputs
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OEM-style connectors with quick-connect harnesses for faster installation
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Includes constant 12V, ground, and remote turn-on connections
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Preserves factory wiring for a clean, reversible installation
