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Holley EFI Unterminated Main Harnesses
Wiring Harnesses, Holley EFI, Main Harness, Unterminated, Flying Lead, 15 ft. Long, J1A/J1B Connectors, Plug Seals Included, Universal, Each
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Estimated Ship Date: Monday 11/2/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
558-126
Part Type:
Product Line:
Summit Racing Part Number:
HLY-558-126
UPC:
090127054857
Harness Length:
Extra-long
Fuse Block Included:
Yes
Quantity:
Sold individually.
Notes:
This unterminated harness features both J1A and J1B connectors fully terminated with 15 ft. of flying lead wire and 30 optional plug seals.
Holley EFI Unterminated Main Harnesses
Want to fully rewire your Holley EFI installation? Or perhaps you're starting a new build, and want to wire everything perfectly the first time. Holley EFI unterminated main harnesses come with both J1A and J1B connectors fully terminated—with 15 ft. of flying lead wiring to allow you to completely customize your main harness installation.
Features include:
* J1A and J1B terminated connectors
* 60 crimped wires: (57 of 20-gauge wire, and three 18-gauge wire)
* 15 ft. long flying lead harness
* 30 optional plug seals
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Some parts are not legal for use in California or other states with similar laws / regulations
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