7-Pin Main Harness - Sniper TBI

The 7-Pin Main Harness - Sniper TBI from Holley is a complete EFI wiring solution designed for modern engine management installations requiring integrated fuel pump and fuse relay control. This main battery harness serves as the backbone of a Holley Sniper TBI (Throttle Body Injection) system, delivering reliable power distribution and signal integration from battery to injectors, ignition, and auxiliary circuits. Whether you're building a classic car restomod or upgrading a fuel-injected engine platform, this harness eliminates the confusion of point-to-point wiring by consolidating critical power and relay functions into one organized assembly.

The 7-pin configuration integrates fused battery connections and dedicated fuel pump relay circuits, ensuring safe, regulated power delivery to fuel injectors and engine control modules. Holley's engineered harness design includes properly gauged wire for high-current applications and factory-sealed connectors that resist corrosion and vibration-induced failures—critical for reliable cold starts and idle quality. The modular 7-pin connector interface allows seamless integration with Sniper TBI ECU units while maintaining compatibility with standard automotive relay and fuse block configurations. Weighing 1.35 lbs and measuring approximately 10.6 × 3.8 × 11.2 inches, the harness packages compactly without compromising wire routing flexibility through engine bays of varying sizes.

Restorers, street rod builders, and performance enthusiasts benefit most from this plug-and-play harness when installing Holley Sniper TBI systems on carbureted or older fuel-injected platforms. Installation requires basic electrical knowledge and familiarity with battery terminals, fuse blocks, and relay mounting locations—no custom fabrication needed if following Holley's wiring diagrams. The main harness is compatible with all Holley Sniper TBI kits (4150 and 4500 series) and works with both traditional 12-volt negative-ground electrical systems and modern vehicles undergoing conversion. For anyone seeking a professional-grade, time-tested fuel injection harness solution, this Holley assembly delivers proven reliability and simplified installation.