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Holley EFI Systems Main Wiring Harnesses

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Choose EFI main power wiring harnesses from Holley to meet your needs. Several choices are offered—TBI, LS applications, multi-point, and un-terminated harnesses—to feed and carry your engine's electrical supply. Get wired for electronic fuel injection with Holley EFI systems main wiring harnesses.

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Fuel Injection System Components, Holley EFI, Main Harness, Plug-and-Play, Factory PWM/IAC Connectors, with OE Injectors, Ford, Mustang, 5.0L, Each

Part Number: HLY-558-128

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Wiring Harnesses, Holley EFI, LT4 Engine, Main Harness, for Terminator X, V3 ECU, Cadillac, Chevy, Each

Part Number: HLY-558-130

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Wiring Harnesses, Holley EFI, Coyote, with TI-VCT/Stock Coils, Main Harness, MPFI, for HP, Dominator, EFI Systems, Ford, 5.0L, Each

Part Number: HLY-558-110

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Wiring Harnesses, Holley EFI, Main Harness with Smart Coils, 7.3L Godzilla, Ford Each

Part Number: HLY-558-141

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Wiring Harnesses, Holley EFI, Main Harness with Stock Coils, 7.3L Godzilla, Ford Each

Part Number: HLY-558-140

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