Haltech NEXUS S2/S3 Universal Wire-In Harness Kit - 2.5M (8ft) - HT-182200

The Haltech NEXUS S2/S3 Universal Wire-In Harness Kit (HT-182200) is a purpose-built, 2.5-metre (approximately 8-foot) wiring harness designed to work hand-in-hand with the Haltech NEXUS S2 and NEXUS S3 engine management systems. Whether you're building a custom engine bay, swapping a new powerplant into a project car, or constructing a full race vehicle from scratch, this universal wire-in harness gives you a clean, organized foundation for your ECU installation without the headaches of starting from bare wire.

Key Features & Benefits

• Designed Specifically for NEXUS S2 & S3 ECUs: This harness is engineered to mate directly with the Haltech NEXUS S2 and S3 engine management units, ensuring correct connector types and pin layouts right out of the box — no adapter guesswork required.
• 2.5M (8ft) Length: The generous 2.5-metre harness length provides enough reach to route cleanly through most engine bays and firewall configurations, reducing the need for extensions on the majority of custom builds.
• Universal Wire-In Design: Because this is a universal harness rather than a vehicle-specific unit, it gives builders and tuners maximum flexibility to wire sensors, injectors, coils, and ancillary outputs exactly as their application demands.
• Clean Build Quality: Haltech's harness kits are built to the standards expected of professional-grade motorsport electronics, supporting a tidy, professional-looking installation that holds up in demanding engine bay environments.
• Saves Build Time: Starting with a pre-terminated, ECU-matched harness dramatically reduces the hours spent sourcing connectors and crimping individual pins, letting you focus on tuning and performance rather than wiring logistics.
• Pairs with the Haltech Ecosystem: As part of the Haltech NEXUS product family, this harness is designed to complement Haltech's broader range of accessories, expansion loom kits, and plug-in modules — making future upgrades and additions straightforward.

Specifications

• Manufacturer Part Number (MPN): HT-182200
• Brand: Haltech
• Harness Length: 2.5M (approximately 8 feet)
• Compatible ECUs: Haltech NEXUS S2, Haltech NEXUS S3
• Harness Type: Universal Wire-In

Fitment

The HT-182200 is a universal wire-in harness and is not vehicle-specific. It is compatible with any application where a Haltech NEXUS S2 or NEXUS S3 ECU is being installed — including custom engine swaps, purpose-built race cars, kit cars, off-road builds, and dedicated track vehicles. Because fitment depends on your ECU choice rather than a specific year/make/model combination, it is the builder's responsibility to confirm that the NEXUS S2 or S3 ECU itself is appropriate for their engine and application before purchasing this harness. If you are running a different Haltech ECU platform (such as the Elite series), this harness is not the correct match — Haltech offers separate harness kits for those platforms.

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimum required, no hidden freight charges at checkout.
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• Enthusiast-Focused Support: Our team understands performance builds. If you have questions about whether the NEXUS S2/S3 harness kit is the right choice for your project, reach out before you order — we're here to help you get it right the first time.

Frequently Asked Questions

Which Haltech ECUs does this harness work with?

The HT-182200 is designed specifically for the Haltech NEXUS S2 and NEXUS S3 engine management systems. It is not compatible with other Haltech ECU families.

Is this harness vehicle-specific or universal?

This is a universal wire-in harness, meaning it is not pre-configured for any particular make, model, or engine. It provides the wiring foundation for a custom installation and must be wired to suit your specific sensors, actuators, and engine configuration.

How long is the harness?

The harness measures 2.5 metres, which is approximately 8 feet in length.

Do I need any additional components to complete my installation?

This harness kit is the wiring foundation for a NEXUS S2 or S3 installation. Depending on your build, you may also require the ECU itself, sensors, injector and coil connectors, and potentially Haltech expansion loom accessories. We recommend reviewing Haltech's full NEXUS product ecosystem and consulting with a qualified installer or tuner to confirm everything you'll need for your specific application.