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Unterminated 15' Flying Lead Main Harness

Pre-Terminated J1A / J1B 15' Flying Lead Main Harness

PART# 558-126

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The unterminated main harness comes with both J1A and J1B connectors full terminated with 15' of flying lead wiring.


  • 15’ long flying lead harness, allows you to completely customize your main harness installation
  • 60 Holley Crimped Wires (57x 20 ga, 3x 18 ga)
  • 30 optional plug seals


BrandHolley EFI
Emission Code4
Harness ApplicationUniversal
Harness TypeMain
Product TypeUniversal Unterminated Main Engine Harness
Part Number558-126



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

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