This main power harness is required for Avenger EFI, HP EFI, and Dominator EFI installations, supplying fused 10 AWG battery power to the ECU. It runs 13 feet and includes two 3/8" ring terminals and heat-shrink tubing, with braided split-loom covering the full length for added abrasion protection.
Specifications:
- Wire Diameter: 10 AWG
- Wire Length: 13 feet
- Wire Series: Automotive TXL
- Fuse: 40 amp max
- Included Hardware: (2) 3/8" ring terminals, heat-shrink tubing
- Application: Universal, required with HP or Dominator ECUs
- Part Number: 558-308
Must be connected directly to the battery terminals — do not tie into a disconnect switch, starter solenoid, or distribution lug. If the 13-foot length needs to be extended, use 8 AWG or larger multi-strand wire.
FAQ
Is this harness required for HP or Dominator EFI?
Yes, Holley specifies this main power harness as required for Avenger EFI, HP EFI, and Dominator EFI installations.
Where does this harness connect?
It must connect directly to the battery terminals — not to a disconnect switch, starter solenoid, or distribution lug.
Can I extend the 13-foot length?
Yes, if needed, extend it using 8 AWG or larger multi-strand wire.
What fuse protection does it include?
The harness is fused at 40 amps max.
