Wiring Harnesses

Wiring harnesses are the central nervous system of any vehicle, bundling and protecting the electrical connections that power everything from sensors and fuel injectors to lighting and infotainment. Whether you're replacing a damaged factory harness, building a standalone engine management system, or adding aftermarket accessories, a properly constructed harness ensures reliable signal transmission and resistance to vibration, heat, and moisture.

Our collection includes harnesses built with automotive-grade wire, sealed connectors, and protective loom or sheathing to meet the demands of underhood and interior environments. Key features to look for include:

  • Correct wire gauge (AWG) for current load and length
  • High-temperature insulation (often cross-linked polyethylene or TXL/GXL)
  • OEM-style connectors with sealed terminals where applicable
  • Pre-terminated or customizable configurations for specific components
  • Shielding for sensitive signal circuits (e.g., cam/crank sensors, knock, CAN bus)

From simple two-wire pigtails to full engine bay rewiring kits, choose a harness that matches your build's requirements for durability and compatibility. Always verify connector pin counts, wire colors, and circuit assignments against your vehicle's service manual before installation.

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Fleece Performance outer injector connector pigtail with 6-inch wiring for 2001-2004 6.6L Duramax LB7 engines.

$29.99

In stock
Fleece Performance LML Duramax fan extension harness with factory-style connectors and high-quality wiring.

$45.99

In stock
Fleece Performance L5P Duramax fan extension harness with automotive connectors and protective wire sleeving.

$45.99

In stock
Fleece Performance sensor pigtail harness with 6-inch leads and heat-shrink connectors for 5.9L Cummins engines.

$20.99

In stock
Fleece Performance 6-inch turbocharger actuator pigtail with 6-pin connector for Holset HE300VE/VG turbochargers

$27.99

In stock
Fleece Performance MAP sensor pigtail harness with 6-inch leads for 2003-2007 Dodge Ram 5.9L Cummins engines.

$21.99

In stock
Fleece Performance MAF sensor connector with 6-inch pigtail wiring for 6.7L Cummins engines

$29.99

In stock
Fleece Performance 6-inch temperature sensor pigtail with connector for 6.7L Cummins engines.

$26.99

In stock
Fleece Performance fuel heater and turbo wastegate solenoid electrical connector with 6 inch pigtail and butt connectors

$17.99

In stock
Fleece Performance crankshaft position sensor extension harness with 6-inch pigtail and heat-sealable connectors.

$39.99

In stock
Fleece Performance cooling fan pigtail repair kit with both connector sides and 6-inch flying leads for 6.7L Cummins.

$59.99

In stock
Fleece Performance crankcase pressure sensor pigtail with 6-inch wiring and heat-shrink connectors for 6.7L Cummins.

$25.99

In stock
Fleece Performance 4.5-inch crankshaft and camshaft sensor pigtail with heat-shrink connectors for 5.9L Cummins engines.

$29.99

In stock
Fleece Performance VGT Actuator Harness Adapter with heavy-duty automotive connectors and protective wire loom.

$44.95

In stock
AEM 30-3443 replacement wiring harness for X-Series temperature gauges with color-coded wires and quick-connect plugs.
$23.18 $25.08
-8%
Low in stock
XK Glow XKmax series Y-splitter wire with weather-resistant snap-lock connectors for LED lighting systems

$8.99

Low in stock
Westin parking sensor harness extension kit with 20 gauge pigtails and connectors for 2019-2026 Chevrolet, GMC, and Ram

$55.00

Low in stock
TI Automotive Walbro 94-686 fuel pump wiring harness with insulated pigtail leads and a multi-pin connector.

$12.90

In stock
TI Automotive Walbro GSS series fuel pump replacement wire harness pigtail with insulated leads 94-615

$8.10

In stock
Electrical wiring connector plug with pigtail for Walbro E85 high-output fuel pumps

$21.30

In stock
Radium Engineering 17-inch fuel pump connector harness with specialized plug for Walbro E85 pumps.
$18.95 $19.95
-5%
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TurboXS plug-and-play wiring harness with relay and connectors for Hella horn installation on a 2015-2021 Subaru WRX STI.

$48.00

In stock
Torque Solution plug-and-play speed density wiring harness and stainless steel weld-on bung for Subaru WRX and STI.

$101.10

Low in stock
Torque Solution plug-and-play speed density wiring harness for 2008-2021 Subaru WRX and STI

$99.99

Out of stock
Torque Solution plug and play speed density adapter harness with OEM-style connectors for Subaru WRX and STI.

$79.99

Out of stock
Torque Solution plug and play speed density conversion harness and weld-on stainless steel bung for Subaru applications.

$101.10

Low in stock
Torque Solution plug and play speed density conversion harness with aluminum weld-on IAT sensor bung

$99.99

In stock
Torque Solution plug and play speed density adapter harness with multi-pin connectors and protective wire sleeving.

$79.99

Low in stock
Torque Solution MAP sensor adapter harness with plug-and-play connectors for Nissan GT-R R35.

$27.77

Out of stock
Torque Solution fast response GM style IAT sensor with electrical pigtail connector and stainless steel weld-on bung.

$36.65

Out of stock

Can’t Find the Part You Need?

Our catalog represents only a portion of the automotive products available through our supplier network. If you cannot find a specific part, brand, or application on our website, submit a request below, and our team will help source it for you.

Please include as much information as possible, such as your vehicle's year, make, model, trim, engine, desired brand, or part number, to help us quickly identify the correct product.

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