These Holley Ignition harnesses is designed for use with your Holly Avenger, HP, or Dominator EFI System. These wiring harnesses work with other Holley components to properly configure your EFI system. Holley offers different harnesses to fit your application whether you have Magnetic Pickup, HEI, TFI, or an LS, we have the harness for you.
- 558 – 303: Magnetic Pick-up Ignition Harness, Shielded Unterminated
- 558 – 304: HEI GM Small Cap Ignition Harness
- 558 – 305: Ford TFI Ignition Harness
- 558 – 306: Universal Unterminated Ignition Harness
- 558-310: Gen III HEMI Coil Harness, Early Coils
- 558-311: Gen III HEMI Coil Harness, Late Coils
- 558-314: Coil Harness for 99-04 2 Valve Ford Modular (4.6 & 5.4L) engines
- 558-315: Coil Harness for 99-04 4 Valve Ford Modular (4.6 & 5.4L) engines
- 558-317: Coil Harness for 2011 to 2015 Ford Coyote (5.0L) engines
- 558-321: Factory replacement coil harness for stock LS coils, sub harness
- 558-410: Crank/Cam Ignition Harness, fully terminated harness
- 558-431: Crank/Cam Ignition Harness for Ferrous Crank/Magnetic Cam Hall Effect Sensors, fully terminated harness