Wiring Harnesses

44 products

44 products
ON SALE
AEM CD Carbon Dash 2-Button External Button Kit
AEM CD Carbon Dash 2-Button External Button Kit
AEM
Walbro Fuel Pump Wiring Harness - 94-686
Walbro Fuel Pump Wiring Harness - 94-686
Walbro
Walbro GSS Fuel Pump Replacement Wiring Harness - 94-615
Walbro GSS Fuel Pump Replacement Wiring Harness - 94-615
Walbro
Walbro E85 Fuel Pump Plug - 000107694/AA
Walbro E85 Fuel Pump Plug - 000107694/AA
Walbro
ON SALE
Radium Engineering Porsche Fuel Pump Connector Harness 17in - Walbro E85
Radium Engineering Porsche Fuel Pump Connector Harness 17in - Walbro E85
Radium Engineering
HKS Turbo Timer Harness - Universal
HKS Turbo Timer Harness - Universal
HKS
ON SALE
Kooks Front O2 Sensor Extension Harness 8in - Ford Mustang GT 2018+
Kooks Front O2 Sensor Extension Harness 8in - Ford Mustang GT 2018+
Kooks Headers
HKS Turbo Timer Harness - Nissan 240SX 89-98, 300ZX Twin Turbo 84-89
HKS Turbo Timer Harness - Nissan 240SX 89-98, 300ZX Twin Turbo 84-89
HKS
HKS Turbo Timer Harness - Mitsubishi Evo 8/9/10 2003-2009, Eclipse MT-6 1995-1999
HKS Turbo Timer Harness - Mitsubishi Evo 8/9/10 2003-2009, Eclipse MT-6 1995-1999
HKS
HKS Turbo Timer Harness - FTP-1
HKS Turbo Timer Harness - FTP-1
HKS
HKS Turbo Timer Harness - Nissan 200SX 84-88
HKS Turbo Timer Harness - Nissan 200SX 84-88
HKS
ON SALE
AEM Main Harness for X-Series Temperature Gauge 30-0302
AEM Main Harness for X-Series Temperature Gauge 30-0302
AEM
ON SALE
AEM Power Harness for X-Series 30-0300 Wideband Gauge
AEM Power Harness for X-Series 30-0300 Wideband Gauge
AEM
ON SALE
AEM Replacement Sensor Harness for Digital Wideband Gauge 30-4110
AEM Replacement Sensor Harness for Digital Wideband Gauge 30-4110
AEM
ON SALE
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1994-1997
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1994-1997
Mishimoto
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1993-1996
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1993-1996
HKS
HKS Turbo Timer Harness - NT-2 (USA)
HKS Turbo Timer Harness - NT-2 (USA)
HKS
ON SALE
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1998-2003
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1998-2003
Mishimoto
ON SALE
Radium Engineering Fuel Surge Tank DIY Wiring Kit
Radium Engineering Fuel Surge Tank DIY Wiring Kit
Radium Engineering
ON SALE
Radium Engineering Fuel Cell Subharness Kit for FCST-X / FCST
Radium Engineering Fuel Cell Subharness Kit for FCST-X / FCST
Radium Engineering
ON SALE
Radium Engineering Adjustable Pressure Switch
Radium Engineering Adjustable Pressure Switch
Radium Engineering
ON SALE
Radium Engineering Internal Harness for Walbro GSS Style Pump - Ring Terminals
Radium Engineering Internal Harness for Walbro GSS Style Pump - Ring Terminals
Radium Engineering
ON SALE
Radium Engineering Fuel Pump Connector Harness 10in - Walbro E85
Radium Engineering Fuel Pump Connector Harness 10in - Walbro E85
Radium Engineering
ON SALE
Radium Engineering Bulkhead Harness for Internal Triple Walbro F90000262 Pump
Radium Engineering Bulkhead Harness for Internal Triple Walbro F90000262 Pump
Radium Engineering
ON SALE
Kooks O2 Sensor Extension Harness - Chevrolet Corvette C7 2014-2019
Kooks O2 Sensor Extension Harness - Chevrolet Corvette C7 2014-2019
Kooks Headers
ON SALE
Kooks O2 Sensor Extension Harness - Chevrolet Corvette C6 2005-2013
Kooks O2 Sensor Extension Harness - Chevrolet Corvette C6 2005-2013
Kooks Headers
ON SALE
Kooks 6-Pin Rear O2 Sensor Extension Harness 12in - Ford Mustang Shelby GT500 2011-2014
Kooks 6-Pin Rear O2 Sensor Extension Harness 12in - Ford Mustang Shelby GT500 2011-2014
Kooks Headers
ON SALE
Kooks O2 Sensor Extension Kit 10in/8in Left - Chevrolet Camaro SS 2016-2020
Kooks O2 Sensor Extension Kit 10in/8in Left - Chevrolet Camaro SS 2016-2020
Kooks Headers
ON SALE
Kooks O2 Sensor Extension Harness - Dodge Hellcat 2015+
Kooks O2 Sensor Extension Harness - Dodge Hellcat 2015+
Kooks Headers
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1997-1998
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1997-1998
HKS
HKS Turbo Timer Harness TT-3 - Toyota Supra, MR2 Turbo 1991-1995, Celica All-Trac
HKS Turbo Timer Harness TT-3 - Toyota Supra, MR2 Turbo 1991-1995, Celica All-Trac
HKS
HKS Turbo Timer Harness - Mitsubishi 3000GT, Eclipse 89-94, Galant Turbo 1990-1993, Mirage Turbo 85-88
HKS Turbo Timer Harness - Mitsubishi 3000GT, Eclipse 89-94, Galant Turbo 1990-1993, Mirage Turbo 85-88
HKS
HKS Turbo Timer Harness FT-3 - Subaru WRX/STi 2002-2007
HKS Turbo Timer Harness FT-3 - Subaru WRX/STi 2002-2007
HKS
HKS Turbo Timer Harness FT-2 - Subaru Impreza RS 1997-2000
HKS Turbo Timer Harness FT-2 - Subaru Impreza RS 1997-2000
HKS
HKS Turbo Timer Harness FT-6 - Subaru WRX/STi 2008+
HKS Turbo Timer Harness FT-6 - Subaru WRX/STi 2008+
HKS
ON SALE
Mishimoto Glow Plug Harness - Ford 6.0L Powerstroke 2005-2007
Mishimoto Glow Plug Harness - Ford 6.0L Powerstroke 2005-2007
Mishimoto
ON SALE
Mishimoto Glow Plug Harness - Ford 6.0L Powerstroke 2003-2004
Mishimoto Glow Plug Harness - Ford 6.0L Powerstroke 2003-2004
Mishimoto
ON SALE
Air Lift Performance Second Compressor Harness for 3H/3P Systems
Air Lift Performance Second Compressor Harness for 3H/3P Systems
Air Lift
Air Lift WirelessAIR Main Wiring Harness (2nd Generation)
Air Lift WirelessAIR Main Wiring Harness (2nd Generation)
Air Lift
Air Lift WirelessONE Wiring Harness (2nd Generation)
Air Lift WirelessONE Wiring Harness (2nd Generation)
Air Lift

Wiring Harnesses & Engine Wiring

Wiring harnesses carry electrical signals and power between the ECU, sensors, actuators, and accessories throughout the vehicle. From standalone engine management harnesses for swaps to replacement factory harnesses and auxiliary wiring kits, the right harness ensures clean, reliable electrical connections.

OneFastShop carries wiring harnesses including standalone engine harnesses, engine swap wiring kits, fuel injector harnesses, coil pack harnesses, auxiliary accessory wiring kits, and direct-fit replacement harnesses for popular engine platforms and swap applications.

Every wiring harness at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're wiring an engine swap, replacing a damaged factory harness, or adding a dedicated harness for aftermarket accessories, OneFastShop has the harness. Shop the full wiring harnesses collection today.
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