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A rectangular plastic wiring harness with multiple coloured wires and a multi-pin connector

Metra Electronics

Metra Electronics 70-7901 Power 4 Speaker Wire Harness car electronics accessory

SKU CH-KN02-55844

Connects an aftermarket stereo to the factory wiring in select 1990-2001 Mazda models with a four-speaker power harness

  • Product typeCar Stereo Add-Ons
  • Plugs directly into the factory radio harness for simple installation
  • Powers four speakers without cutting or splicing original wiring
  • Matches Metra 70-7901 specification for exact fit and function
  • Compatible with Mazda 323 1990-1994 and 626 1992-2000 models
  • Fits MX-5 Miata 1990-2001 and Protege 1990-2000 vehicles

Vehicle Fitment

This wiring harness connects an aftermarket stereo to the factory plug in select Mazda vehicles built between 1990 and 2001. It covers the 323, 626, 929, MX-5 Miata, Millenia, MPV Van, MX3, MX6, Protege, Tribute and RX7 models. Installers working on these platforms can retain the original wiring without cutting or splicing. The harness carries power and four speaker channels through a single connector.

Signal Integrity

The moulded plug mates directly with the vehicle harness at the radio cavity, providing a secure connection that resists vibration and temperature cycling. Colour-coded leads follow the standard aftermarket pinout so power, ground and each speaker pair line up without guesswork. Because the interface is passive copper, it adds no active circuitry that could fail under sustained use. The connection remains stable for the life of the installation.

Installation Notes

Routing the harness behind the dash is straightforward on the listed models, though the MX-5 Miata centre console can restrict hand access. The factory connector sometimes develops brittle locking tabs after decades of heat exposure, so handle it gently when unplugging. No special tools are required beyond a panel removal tool and wire strippers for the stereo side. Verify the vehicle year against the 1990-2001 range before starting.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 92% of the 2,768 comparable items (median $21.99).

Specifications

Product
Product typeCar Stereo Add-Ons

Questions about this item

Does the 70-7901 harness draw any power or generate heat once the stereo is running all day?

The harness is a passive wiring adapter with no electronics, so it draws no power and produces no heat during continuous use.

What must already be present in the dashboard for the 70-7901 to plug in and work?

The factory radio connector that matches the Mazda 323, 626, 929, MX-5 Miata, Millenia, MPV, MX3, MX6, Protege, Tribute or RX7 models listed for 1990 through 2001 must be in place.

Will the 70-7901 still connect correctly if the original Mazda speaker wiring has aged or been repaired?

Yes, the harness mates to the factory plug; as long as that plug and its pins are intact, the adapter will carry the four speaker channels without modification.

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