Wiring Harnesses & Connectors

Wiring Harnesses, Connectors & Electrical Assembly Components

A clean, correctly specified electrical system is one of the foundations of a reliable performance vehicle. Poor electrical connections — whether through incorrect wire gauge, inadequate insulation, corroded terminals, or improvised connections — cause intermittent faults that are among the most frustrating and time-consuming problems to diagnose in any vehicle. Quality wiring harnesses, pre-terminated connectors, and correctly rated bulk wire eliminate these issues from the start, producing an electrical system that functions correctly from first startup and continues to do so reliably throughout the vehicle's life.

With 73 electrical assembly products from Holley EFI, Earl's, ACCEL, and BP Automotive, our wiring range covers engine wiring harnesses for LS and EFI applications, bulk wire for custom harness construction, connectors and seals for weatherproof connections, and the specialised components required for professional-quality electrical installations.

Engine Wiring Harnesses — Plug-and-Play Installation

A quality engine wiring harness eliminates the most challenging aspect of an LS swap or EFI conversion — the wiring. Pre-terminated, colour-coded, and labelled harnesses designed for specific engine and ECU combinations connect directly to the engine's sensors, actuators, and management system with correct connector types and wire gauges, eliminating the need to source individual connectors and build connections from scratch. Our harness range covers popular LS engine and standalone ECU combinations for the most common swap applications.

Bulkhead Connectors and Firewall Penetrations

Bulkhead connectors allow clean, weatherproof routing of wiring through the firewall between the engine bay and interior — avoiding the improvised grommets and individual wire penetrations that characterise less carefully built vehicles. A quality bulkhead connector presents a professional appearance, maintains the firewall's noise and vapour barrier, and provides a positive, weatherproof connection at the critical firewall junction.