Wiring solutions built around your conversion
No two conversions are exactly the same. The engine, transmission, ECU, donor wiring and the vehicle it is being fitted into can all change what is required.
At Ultimate Conversion Wiring, we don't believe in making the vehicle fit the wiring. We work out what the conversion needs and build or modify the wiring to suit.
Whether you're starting with a donor engine loom that needs to be reworked, want a complete new engine harness package, or need a vehicle-specific plug-in solution, the aim is the same — a clean, reliable installation that takes as much unnecessary wiring and guesswork out of the conversion as possible.
Engine Harness Kits
Our Engine Harness Kits are built from scratch using new genuine connectors, terminals and seals.
Rather than starting with an old donor loom and modifying it, these harnesses are built specifically for the application. Depending on the conversion and kit selected, the package can include the engine harness, relays and fuses for the required engine systems, ECU and programming, and where required items such as the electronic accelerator pedal, automatic shifter or BCM.
Many kits can be supplied with the ECU programmed with a suitable base file and security removed, allowing the conversion to be started and test run before the vehicle goes to your tuner for its final calibration.
Because every conversion is different, exactly what is included will be clearly specified for each harness kit.
Mail Order Looms
Already have the engine loom that came with your donor engine?
Our Mail Order Loom service allows you to send your existing engine harness to us to be reworked for your conversion.
We remove the unnecessary donor-vehicle wiring and modify the harness into a simplified standalone or plug-in arrangement suited to the application. The completed loom is then returned ready for installation with the aim of keeping the wiring required at the vehicle end to a minimum.
Once you receive it back, you're not left on your own. Technical support is available when it comes time to install the loom and get the conversion running.
Plug-In Conversion Harnesses
For selected vehicle and drivetrain combinations, UCW can provide a more integrated plug-in conversion wiring solution.
These harnesses are designed around both sides of the conversion — the engine and drivetrain being installed and the vehicle they're going into.
Where applicable, this allows us to integrate the conversion with the vehicle's existing wiring and retain the appropriate factory functions, reducing the amount of additional wiring required during installation.
Available combinations will vary, so we'll make it clear which conversions have a dedicated plug-in solution.
Some of the conversions we've wired
The combinations shown here will be examples of work produced by UCW over the years. We'll add the real loom photos and identify the vehicle, engine, transmission and ECU combination where known.
6L / TH400 → Early VN Commodore
Plug-in conversion loom.
6L / TH400
Standalone conversion loom.
VS Commodore 5L / A4
Plug-in loom using LS1 PCM.
E67 / 6L90E
Conversion loom with Tap Shift BCM.
Plug-In VR 6L / 6L80E
Plug-in VR 6L / 6L80E conversion package with Tap Shift module, pedal, E38 ECU and speedo corrector all supplied.
Talk to us about your project.
The combinations shown on this page are only examples. If you can't see your exact vehicle, engine or transmission combination, that doesn't necessarily mean we can't do it.