Metra Amplified Wire Harness for 2008+ Honda

Metra 70-1730 is an amplified wiring harness that lets you swap an aftermarket head unit into compatible 2008-and-up Honda vehicles while preserving the factory amplifier and providing RCA outputs for easy installation.

If you're upgrading the factory radio in a 2008 or newer Honda and want a clean, reliable connection without cutting factory wiring, this Metra harness is made for that job. It plugs directly into the car's radio connector and converts speaker outputs to RCAs while maintaining the factory amplified system. The harness simplifies wiring, minimizes splices, and reduces installation time compared with trying to harvest signals from the vehicle's amp or fabricating custom adapters.

How does this harness keep my vehicle’s factory amplifier working?

The 70-1730 is designed specifically as an amplified harness, meaning it retains the car’s original amplifier wiring so the factory amp continues topower speakers. Instead of exposing raw speaker wire, the harness uses RCA outputs to feed signal-level inputs on aftermarket head units or external processors. That preserves factory sound system logic and avoids errors from losing amp communication.

• Maintains amplifier connection to vehicle wiring
• Provides signal-level RCA outputs for aftermarket head units
• Reduces need to rewire speaker leads or bypass amp
• Compatible with many 2008+ Honda models — plugs into OEM radio harness

What makes the RCA outputs better than exposed speaker wires?

RCAs carry low-level audio signals meant for head units and signal processors, offering cleaner, more stable connections than raw speaker wire. Using RCAs helps prevent grounding problems and preserves audio fidelity when connecting to line-level inputs. Installers also find RCAs easier to route behind a dash and to connect to external amps or adapters.

• Delivers line-level outputs compatible with aftermarket inputs
• Less susceptible to noise and grounding issues than speaker-level taps
• Simpler connections for external amplifiers and processors
• Cleaner, safer dash wiring with fewer splices

What’s included and how straightforward is installation?

The package contains the Metra wire harness and a manual to guide installation. It’s a plug-and-play-style adapter designed to mate with the OEM radio connector in supported Hondas, so you avoid cutting factory harnesses. Typical installation requires basic dash removal and standard tools; professional installation is recommended if you’re not comfortable with vehicle wiring.

• Included: Metra wire harness and printed manual
• Plugs into car’s radio harness — no splicing required for many installs
• Works with aftermarket head units that accept RCA inputs
• Requires basic dash disassembly and standard tools

Which Honda models and years will this harness fit?

This harness is intended for Honda vehicles from 2008 and later that use the factory amplified audio architecture Metra supports. Compatibility can vary by trim and factory audio option, so confirm fitment with your vehicle’s model, year and original radio type before purchasing. If your car uses a factory amp and the OEM radio harness matches Metra’s connector layout, this harness is the proper plug-in solution.

• Designed for 2008 and up Honda vehicles with factory amplifier systems
• Compatibility depends on factory radio and trim level
• Check vehicle fit guides or Metra documentation before buying
• Professional installers can verify fit quickly during install

Who is this for: The Metra 70-1730 harness is aimed at car audio enthusiasts, DIY installers, and professional shops upgrading Hondas from 2008 onward that want to replace the factory radio without losing the factory amplifier. It’s especially useful when installing aftermarket head units that accept RCA inputs or when you want a tidy, reversible installation that preserves OEM wiring and audio functionality.