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A black plastic wiring harness with multiple coloured wires and an RCA connector block

METRA

METRA 70-5517 Ford factory amplifier interface harness car electronics accessory

SKU CH-FVH8-ADRVC

Factory amplifier interface harness retains the original amp using aftermarket radio RCA outputs

  • TypeCar Stereo Add-Ons
  • Retains factory amplifier when upgrading radio
  • Plugs directly into vehicle harness for clean install
  • Converts speaker-level signals to RCA outputs
  • Designed for low-level input aftermarket radios
  • New Metra harness for Ford applications

Factory Amplifier Retention Harness

The Metra 70-5517 is a factory amplifier interface harness designed for Ford vehicles. It connects an aftermarket radio to the vehicle's existing wiring while keeping the original amplifier active. This accessory is intended for installers or owners upgrading the head unit without replacing the factory sound system.

Low-Level RCA Output Only

The harness is configured exclusively for low-level inputs using the RCA outputs from the aftermarket radio. It does not support speaker-level signals, so the replacement head unit must provide pre-amp outputs. If the new radio lacks RCA outputs, this interface will not function correctly.

Plug-and-Play Factory Connector

The harness plugs directly into the vehicle's factory wiring harness behind the radio, eliminating the need to cut or splice original wires. This preserves the factory amplifier and simplifies installation while maintaining a clean, reversible connection.

Highlights

  • Retains factory amplifier when upgrading radio
  • Plugs directly into vehicle harness for clean install
  • Converts speaker-level signals to RCA outputs
  • Designed for low-level input aftermarket radios
  • New Metra harness for Ford applications

Specifications

BrandMetra
TypeCar Stereo Add-Ons

Questions about this item

How does the 70-5517 harness work with my aftermarket radio's RCA outputs?

The harness plugs into the factory wiring behind the radio and converts the signal for low-level RCA inputs, letting the aftermarket head unit drive the original amplifier without rewiring.

What connection standard does the 70-5517 use on the vehicle side?

It uses the factory Ford amplifier plug that mates directly with the existing vehicle harness behind the dash.

What space is needed behind the dash to install the 70-5517?

The harness is designed to fit in the factory radio cavity behind the head unit, requiring no extra mounting hardware or modifications.

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