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FuelTech Wiring Harnesses

Harnesses connect a FuelTech ECU to the engine, sensors and accessories. The range runs from pre-terminated engine harnesses to bare unterminated looms, plus adapter harnesses, plug-and-play vehicle harnesses and the connectors to build your own.

What's in this collection

How to choose a harness

  • Complete harness — pre-terminated for an engine family, with relays and fuses built in. The FT550 LS GEN IV harness, for example, supports 58x and 24x triggers and LS3-style coils.
  • Unterminated harness — ECU connector on one end, loose wires on the other, for custom installs. The FT550 needs both A and B harnesses; the B harness alone is for FT450 upgrades.
  • Adapter harness — moves an existing installation to a newer ECU, or links accessories such as peak & hold drivers and wideband controllers.
  • Plug-and-play vehicle harness — plugs into the OEM harness on supported PWCs, UTVs and motorcycles.
  • Connector and plug kits — for repairing a harness or building one from scratch.
Match the ECU model. Harnesses and connector kits are ECU-specific. Check that the listing names your ECU (FT450, FT550, FT600 or FT700) before ordering.
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FuelTech 90 degree injector connector boot
FuelTech

FuelTech 90 Degree Injector Boot

$3.00
5011100166
FuelTech FuelTech Connectors & Plug Kits FuelTech Fuel Injector Connectors FuelTech Fuel Systems FuelTech Wiring Harnesses
A 90-degree boot that goes over an injector connector on a custom harness. It protects the wires where they leave the plug and gives...
FuelTech EGT-8 to dual EGT-4 adapter harness
FuelTech

FuelTech EGT-8 to Dual EGT-4 Adapter Harness

$119.00
2002008648
FuelTech FuelTech Adapter Harnesses FuelTech O2 & EGT Conditioners FuelTech Wiring Harnesses
An adapter harness that lets you replace a FuelTech EGT-8 module with two EGT-4 modules on the same wiring. Use it to expand or...
FuelTech FT550 Suzuki 1300 Gen II adapter harness
FuelTech

FuelTech FT550 Suzuki 1300 GEN II Adapter Harness

$649.00
2002113544
FuelTech FuelTech Complete Harnesses FuelTech Motorcycle Harnesses FuelTech Wiring Harnesses
An adapter harness that connects a FuelTech FT550 directly to the factory wiring on Suzuki 1300 Gen 2 motorcycles. It is built with mil-spec...
FuelTech FT450 Honda Grom plug and play harness
FuelTech

FuelTech FT450 Off-Road Single Cylinder Mini Bike Harness

$239.00
2002007800
FuelTech FuelTech Motorcycle Harnesses FuelTech Wiring Harnesses Honda
A plug-and-play harness that lets a FuelTech FT450 replace the factory ECU on a Honda Grom. It plugs into the stock wiring with a...
FuelTech Bosch LSU 4.2 wideband O2 sensor female connector kit
FuelTech

FuelTech Bosch 4.2 WB-O2 Sensor Connector Kit - Female

$13.00
5011100851
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
A replacement female connector kit for Bosch LSU 4.2 wideband oxygen sensors. It gives a weather-resistant connection for custom wiring, repairs or new sensor...
FuelTech automotive relay holder kit for Mini ISO relays
FuelTech

FuelTech Automotive Relay Holder Kit - 4 Pin - 5 Pin Connector

$25.00
5011100383
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
A mounting housing and terminal set for 4-pin or 5-pin Mini ISO automotive relays (standard 40A relays). It pairs with FuelTech's 40A relay with...
FuelTech air temperature sensor connector plug kit
FuelTech

FuelTech Air Temperature Sensor Plug Kit

$10.00
5005100018
FuelTech FuelTech Connectors & Plug Kits FuelTech Sensors & Valves FuelTech Wiring Harnesses
A mating connector kit for the engine's air temperature sensor. Use it when wiring a custom harness or replacing a damaged IAT plug. Mating...
FuelTech 7-pin igniter connector kit
FuelTech

FuelTech 7-Pin Igniter Connector Kit (Hitachi/Nautica)

$13.00
5011100787
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses Ignition
The mating 7-pin connector for the FuelTech SparkPRO-3 Nautica/off-road igniter and the Hitachi OEM 3-channel ignition module. 7-pin mating connector Fits SparkPRO-3 Nautica/off-road Fits...
FuelTech 37-way AMP CPC connector kit
FuelTech

FuelTech 37-Way CPC Connector Kit

$159.00
5011100124
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
A 37-way CPC circular connector kit for taking a full harness through the firewall, on a new build or a modified loom. Each gold-plated...
FuelTech 24-way main ECU connector kit
FuelTech

FuelTech 24-Way Main Connector Kit

$12.00
5011100297
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
The mating 24-way main connector used across several FuelTech ECUs and modules, for building or repairing a harness. 24-way main connector Fits FT500LITE/FT500 main,...
FuelTech 24-way AMP CPC connector kit
FuelTech

FuelTech 24-Way CPC Connector Kit

$129.00
5011100127
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
A 24-way CPC circular connector kit for running a harness through the firewall, for new builds or modifications. Each gold-plated terminal is rated for...
FuelTech 16-way AMP CPC circular connector kit
FuelTech

FuelTech 16-Way CPC Connector Kit

$109.00
5011100177
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
A 16-way CPC circular connector kit for passing wiring through the firewall cleanly, whether you are building a harness or modifying one. The terminals...
FuelTech 16-way auxiliary ECU connector kit
FuelTech

FuelTech 16-Way Auxiliary Connector Kit

$7.00
5011100298
FuelTech FuelTech Connectors & Plug Kits FuelTech Wiring Harnesses
The mating 16-way auxiliary connector for FuelTech FT500, FT500LITE and FT400 ECUs, for building a harness from scratch or repairing one. 16-way auxiliary connector...
FuelTech FT600 PRO V8 secondary injector harness
FuelTech

FuelTech FT600 PRO V8 Secondary Injector Harness

$549.00
2002109220
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
This expansion plugs into the PRO600 V8 harness and adds a second set of eight injectors, for a total of 16 fully sequential. It...
FuelTech FT Input Expander unterminated 10 ft harness
FuelTech

FuelTech FT Input Expander Harness

$219.00
2001007754
FuelTech FuelTech Switch Panels & Input Expanders FuelTech Unterminated Harnesses FuelTech Wiring Harnesses
The ready-made 10 ft wiring harness for the FuelTech FT Input Expander. It plugs into the module and leaves the sensor ends open so...
FuelTech FT600 PRO V8 complete harness
FuelTech

FuelTech FT600 PRO V8 Complete Harness

$1,699.00
3026109080
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
The FT600 PRO V8 Complete Harness is FuelTech's main loom for putting an FT600 on a racing V8. It comes pre-terminated with all relays...
FuelTech FT550/FT600 PRO V8 smart coil ignition harness
FuelTech

FuelTech FT550/FT600 PRO V8 Smart Coil Harness

$549.00
2002108803
FuelTech FuelTech Complete Harnesses FuelTech Ignition Systems FuelTech Wiring Harnesses Ignition
Add coil-per-cylinder smart coil ignition to a PRO550 or PRO600 V8 harness with this plug-in expansion. It goes through the firewall on a 16-way...
FuelTech FT550/FT600 FTSPARK-8 PRO ignition harness
FuelTech

FuelTech FT550/FT600 FTSPARK-8 PRO Harness

$599.00
2002010982
FuelTech FuelTech Complete Harnesses FuelTech Ignition Systems FuelTech Wiring Harnesses Ignition
This plug-in expansion adds FuelTech's FTSPARK-8 CDI ignition and CDI racing coils to a PRO550 or PRO600 V8 harness. It passes the firewall on...
FuelTech FT550 PRO V8 complete harness
FuelTech

FuelTech FT550 PRO V8 Complete Harness

$1,399.00
3026109037
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
The FT550 PRO V8 Complete Harness connects an FT550 or FT550LITE to nearly any racing V8. It arrives pre-terminated with all relays and fuses...
FuelTech FT Input Expander connector kit 34-pin and CAN connector
FuelTech

FuelTech FT Input Expander Connector Kit

$69.00
5011100445
FuelTech FuelTech Connectors & Plug Kits FuelTech Switch Panels & Input Expanders FuelTech Wiring Harnesses
Everything needed to build your own harness for the FuelTech FT Input Expander: the 34-pin automotive connector, terminals and a CAN 2.0B connector for...
FuelTech EGT-4 male connector kit with pins
FuelTech

FuelTech EGT-4 Connector Kit - Male

$10.00
5011100570
FuelTech FuelTech Connectors & Plug Kits FuelTech O2 & EGT Conditioners FuelTech Switch Panels & Input Expanders FuelTech Wiring Harnesses
The male connector and terminals for wiring a FuelTech EGT-4 exhaust gas temperature controller into your own harness, giving a secure connection to the...
FuelTech EGT-4 female connector kit with pins
FuelTech

FuelTech EGT-4 Connector Kit - Female

$10.00
5011100571
FuelTech FuelTech Connectors & Plug Kits FuelTech O2 & EGT Conditioners FuelTech Switch Panels & Input Expanders FuelTech Wiring Harnesses
The female connector and terminals for wiring a FuelTech EGT-4 into your own harness, whether it is used as an EGT sensor controller or...
FuelTech FT550 Sea-Doo Rotax 300 adapter harness
FuelTech

FuelTech FT550 Rotax 300 Harness

$1,299.00
2002100542
FuelTech FuelTech Sea-Doo PWC FuelTech Water Sports FuelTech Water Sports Harnesses FuelTech Wiring Harnesses
This adapter harness installs a FuelTech FT550 ECU on Sea-Doo watercraft with the Rotax 300 engine, 2010–2023, using the factory wiring. It plugs directly...
FuelTech FT550 Kawasaki SXR 1500 plug and play racing harness
FuelTech

FuelTech FT550 Kawasaki SXR 1500 Racing Harness

$1,299.00
2002114378
FuelTech FuelTech Water Sports Harnesses FuelTech Wiring Harnesses
A plug and play racing harness built specifically for the Kawasaki SXR 1500. It replaces custom wiring on competition skis and ties directly into...
FuelTech EGT-4 CAN SwitchPanel unterminated harness
FuelTech

FuelTech EGT-4 CAN / SwitchPanel Unterminated Harness

$29.00
2001006497
FuelTech FuelTech O2 & EGT Conditioners FuelTech Switch Panels & Input Expanders FuelTech Unterminated Harnesses FuelTech Wiring Harnesses
This 6 ft unterminated harness is used to install a FuelTech EGT-4 CAN signal conditioner, SwitchPanel or Input Expander and tie it into the...
FuelTech FT550 Kawasaki SX-R 1500 jet ski wiring harness adapter
FuelTech

FuelTech FT550 Kawasaki 1500 Harness

$499.00
2002110560
FuelTech FuelTech Kawasaki PWC FuelTech Water Sports FuelTech Water Sports Harnesses FuelTech Wiring Harnesses
This adapter harness lets you remove the factory ECU from a Kawasaki SX-R 1500 and run a FuelTech FT550 standalone in its place for...
FuelTech FT550 2024 Sea-Doo Rotax 325 harness
FuelTech

FuelTech FT550 2024+ Rotax 325 Harness

$1,099.00
2002112825
FuelTech FuelTech Performance Accessories FuelTech Sea-Doo PWC FuelTech Water Sports FuelTech Water Sports Harnesses FuelTech Wiring Harnesses
This FuelTech adapter harness installs an FT550 ECU on 2024 and newer Sea-Doo models with the Rotax 325 engine, plugging straight into the factory...
FuelTech FT550 ECU with Yamaha 1800/1900 2-plug adapter harness
FuelTech

FuelTech FT550 2018-2025 Yamaha 1800/1900 Harness (2 plug)

$1,299.00
2002100540
FuelTech FuelTech Water Sports FuelTech Water Sports Harnesses FuelTech Wiring Harnesses FuelTech Yamaha PWC Yamaha
A 2-plug adapter harness for installing a FuelTech FT550 ECU on 2018–2025 Yamaha 1800/1900 WaveRunners. It connects the ECU to the watercraft with minimal...
FuelTech FT550 2008-2017 Yamaha 1800 3-plug adapter harness
FuelTech

FuelTech FT550 2008-2017 Yamaha 1800 Harness (3 plug)

$1,099.00
2002110173
FuelTech FuelTech Water Sports FuelTech Water Sports Harnesses FuelTech Wiring Harnesses FuelTech Yamaha PWC Yamaha
This adapter harness installs a FuelTech FT550 ECU on a 2008–2017 Yamaha 1800 watercraft using the factory wiring. It plugs straight into the OEM...
FuelTech plug and play Sea-Doo Rotax wiring harness for FT450 and FT550 ECU
FuelTech

FuelTech FT450 2009 & Older Rotax Harness

$949.00
2002100595
FuelTech FuelTech Water Sports Harnesses FuelTech Wiring Harnesses
This plug and play harness lets you pull the factory Siemens ECU out of a 2009 or older Sea-Doo and run a FuelTech FT450...
FuelTech FT550 LS Gen IV complete wiring harness for LS swap
FuelTech

FuelTech FT550 LS Engine GEN IV Complete Harness

$799.00
2002007265
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
The FT550 LS Engine Gen IV Complete Harness replaces the factory GM ECU and harness on an LS so the engine runs standalone on...
FuelTech FT550 Ford Godzilla engine complete harness
FuelTech

FuelTech FT550 Ford Godzilla Engine Complete Harness

$999.00
2002015142
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
This complete harness takes a Ford Godzilla engine swap standalone on a FuelTech FT550 or FT550LITE. It comes pre-terminated for the Godzilla with every...
FuelTech FT550 6 cylinder expansion B harness
FuelTech

FuelTech FT550 6 Cylinder Expansion B Harness

$329.00
2002008377
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
FuelTech's 6 cylinder A and B harnesses are a universal loom for inline-six and V6 engines. The B expansion plugs into the FT550 and...
FuelTech FT550 4 cylinder universal B expansion harness
FuelTech

FuelTech FT550 4 Cylinder Universal B Expansion Harness

$279.00
2002006600
FuelTech FuelTech Complete Harnesses FuelTech Wiring Harnesses
The B expansion harness plugs into the FT550's B connector and works alongside the 4 Cylinder Universal A Harness. It adds four more injector...
FuelTech WB-O2 Datalogger unterminated harness
FuelTech

FuelTech WB-O2 Datalogger Harness

$29.00
2001000056
FuelTech FuelTech Unterminated Harnesses FuelTech Wiring Harnesses
The unterminated harness for the FuelTech WB-O2 Datalogger. It carries the unit's power feed, its analog channel inputs and its analog output. For the...
FuelTech SparkPRO-8 ignition module 18-way unterminated harness
FuelTech

FuelTech SparkPRO-8 Harness

$43.00
2001003164
FuelTech FuelTech Ignition Systems FuelTech Unterminated Harnesses FuelTech Wiring Harnesses Ignition
The unterminated wiring harness for the FuelTech SparkPRO-8 ignition module. The module connector is installed and the leads are left open to wire to...
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