SKU: HLY558-127
UPC: 090127136768
MPN: 558-127
The Bench-Top EFI Test Harness from HOLLEY is an indispensable tool for automotive builders, engine tuners, and mechanics developing or troubleshooting modern fuel injection systems outside the vehicle. It allows for validating newly assembled EFI controllers, diagnosing wiring issues, and bench-testing complete fuel management setups in a controlled environment.
This test harness integrates HOLLEY's proven connectors and terminal geometry to replicate real-world engine bay wiring without permanent installation. Its compact 10.4 x 2.3 x 10.7-inch footprint and lightweight 0.9-pound design make it easy to position on any workbench, while the robust construction withstands repeated connections typical of development cycles.
The harness provides full signal pathways for fuel pump relays, injector drivers, coil outputs, and sensor grounds, allowing you to pulse injectors, verify fuel pump operation, and confirm spark timing signals before committing to full engine assembly. This makes it a valuable asset for anyone working with HOLLEY EFI systems, LS swaps, or custom fuel injection conversions.
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