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ISO Harness & Looms

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Shop ISO harnesses for your vehicle at Car Audio Centre. An ISO harness is an adapter lead that connects a new car stereo adapter to your vehicle’s original wiring using a standard ISO connector, allowing an aftermarket head unit to be installed without cutting factory wires. Our range includes vehicle‑specific ISO harnesses and ISO adapter options for VW, Ford, Vauxhall, Audi, BMW, Nissan, Toyota, and more, all supplied by Connects2. Check the connector on the back of your factory radio, or search your make and model, to find the correct harness.

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Shop ISO Harnesses by Type

Browse by vehicle, factory audio system, and connector type to find the right ISO harness. Each harness converts a vehicle-specific plug to a standard ISO connector for an aftermarket head unit. Check the connector type and any vehicle features before you order.

ISO Harnesses with Aerial & Fakra Adapters

These ISO harnesses act as a radio adapter cable, combining the wiring harness with an aerial or Fakra connection. They suit vehicles using integrated aerial connections or Fakra antenna sockets, ensuring the new stereo stays connected without splicing. Browse our range of Aerial adapter options to maintain reception after installation.

Vehicle-Specific ISO Harnesses

Vehicle‑specific ISO harnesses are designed for individual makes and model ranges, connecting factory wiring to a standard ISO connector for straightforward aftermarket stereo installation. Pin layouts vary by factory connector type, so each harness is matched to the make, model and year rather than to the stereo.

Amplified & Bose Harnesses

Amplified system ISO harnesses are built for vehicles with factory‑fitted amplified audio systems, allowing you to retain the original amplifier when fitting an aftermarket stereo. Certain amplified harnesses also feature CAN bus integration and subwoofer input support, helping preserve sound quality and system functionality.

Universal & ISO to ISO Adapters

Universal harnesses suit cars that already use standard ISO wiring, along with ISO to bare wire leads for older vehicles with no factory plug. The range also includes ISO extension leads for head units with recessed connectors, where the original lead does not reach the back of the stereo.

Why Choose an ISO Harness?

An ISO harness makes fitting a new stereo simpler and safer. Here's what it offers.

No Cutting of Factory Wiring

An ISO harness connects directly to the vehicle's existing wiring, allowing an aftermarket stereo to be installed without cutting or modifying the factory loom. The factory plug unclips from the back of the original radio and clips straight into the harness.

Fully Reversible Installation

Because the original vehicle wiring remains untouched, the factory stereo can be reinstalled at any time, making it suitable for leased vehicles, trade-ins, and preserving resale value.

Correct Power, Speaker Connections & ISO Connectors

An ISO harness adapter connects power, ignition, earth, illumination, and speakers correctly, preventing issues like lost presets or wiring errors. It uses colour‑coded wires for easier matching and a cleaner install. Pair it with a Steering Wheel Control Adapter to retain original controls, though you should check the adapter is listed for your make, model and year.

Faster & Cleaner Installation

An ISO harness makes installation simpler by letting you prepare the stereo wiring before fitting. When the harness matches the vehicle connector, it becomes plug‑and‑play, giving a quicker and tidier setup behind the dashboard. Always disconnect the battery before you start.

Trusted Brand Across the Range

Connects2, a trusted integration brand, supplies every ISO harness here. Known for reliable, vehicle‑specific accessories with documented pin configurations, they make installation easier and more consistent. Those documented layouts also help identify the correct item or stock reference when selecting a harness.

FAQs about ISO Harnesses

What is an ISO harness?

An ISO harness is an adapter lead that connects factory wiring to a standard aftermarket stereo using an ISO connector. It allows installation without cutting or modifying the original wiring loom. Some versions convert vehicle-specific connectors into ISO for easier fitting.

Will an ISO wiring harness adapter work with any aftermarket car stereo?

Most aftermarket stereos use a standard ISO connector, so an ISO harness usually works. Compatibility depends on the car model and factory setup, especially with amplified or Bose systems. Some vehicles, including Volkswagen, Seat, or other VW-group models, may need a more specific adapter depending on the original system.

Can I fit an ISO harness myself?

Fitting an ISO harness is simple for anyone with basic wiring skills. Just remove the factory radio and match the harness to the correct connector for a clean install. If you are unsure, especially where a long lead or extra adapter is needed, seek professional advice.