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Collection: EFI Wires and Harnesses

Wanting to go full-custom on your next fuel injection conversion? Here at Modern Day we offer wiring, harnesses, and much more to allow you to make the EFI set-up you've been waiting for!

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HolleyEFI

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EFI Wires and Harnesses (6 products)

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AC and Heat(285)
Air and Fuel Delivery(6347)
Brake Parts(7667)
Charging and Starting Systems(176)
Cooling Systems(1068)
Electrical and Wiring(343)
Emission Systems(164)
Engine Components(4639)
Exhaust System Parts(14804)
Exterior Body Parts(5386)
Fittings and Hoses(1757)
Ignition System(1554)
Interior Body Parts(3961)
Lighting and Lamps(2560)
Performance Upgrades(1140)
Steering and Suspension Parts(5848)
Tools, Equipment, and Chemicals(393)
Transmission and Drivetrain(3716)
Wheels, Tires, and Parts(696)

Electrical and Wiring Sub-Categories

Search

4WD Switches(1)
Back Up Light Switch(10)
Brake Light Switches(10)
Cable Ties(2)
Cruise Control Buttons(1)
Data Acquisition Components(19)
EFI Wires and Harnesses(69)
Electrical Switches(7)
Fuses(26)
Key Fobs(6)
Keys(11)
Neutral Safety Switches(5)
Oil Pressure Sending Units(20)
Relays(16)
Sensors(81)
Wire Connectors(59)

Drivetrain

Search

4x4
All Wheel Drive
Rear Wheel Drive

Cab Type

Search

Reg Cab
Ext Cab
Crew Cab or Quad Cab

Bed Size

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Short Bed
Long Bed

Brand

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Holley
HolleyEFI

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6 of 69 products

HolleyEFI Ford Coyote Ti-VCT Main Harness for HolleyEFI HP smart coils - 558-122

HolleyEFI Ford Coyote Ti-VCT Main Harness for HolleyEFI HP smart coils - 558-122

Regular price $773.95 USD

Regular price Sale price $773.95 USD
Unit price per
Holley EFI Ford Coyote Ti-VCT Control Module - 554-145

Holley EFI Ford Coyote Ti-VCT Control Module - 554-145

Regular price $1,122.95 USD

Regular price Sale price $1,122.95 USD
Unit price per
Holley EFI Ford Coyote Ti-VCT Sub Harness (2013-2017) - 558-125

Holley EFI Ford Coyote Ti-VCT Sub Harness (2013-2017) - 558-125

Regular price $363.95 USD

Regular price Sale price $363.95 USD
Unit price per
Holley EFI Ford Coyote Engine Main Harness w/ Ti-VCT & stock coil 11-17 -558-110

Holley EFI Ford Coyote Engine Main Harness w/ Ti-VCT & stock coil 11-17 -558-110

Regular price $708.95 USD

Regular price Sale price $708.95 USD
Unit price per
Holley 558-463 - Terminator X Wideband Adapter Harness

Holley 558-463 - Terminator X Wideband Adapter Harness

Regular price $51.62 USD

Regular price Sale price $51.62 USD
Unit price per
Holley EFI Systems Wiring Harnesses 558-103

Holley EFI Systems Wiring Harnesses 558-103

Regular price $522.95 USD

Regular price Sale price $522.95 USD
Unit price per

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