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 transmission internal wire harness connector, 20-way pin seal, and O-ring kit.

$22.99

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Fleece Performance 6-inch electrical pigtail harness with a multi-use connector for fuel and engine sensors.

$27.99

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Fleece Performance 6 inch cooling fan pigtail with electrical connector and heat-sealable butt connectors

$39.99

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Fleece Performance cooling fan adapter harness for 2011-2018 Ford F-250 and F-350 6.7L Power Stroke diesel trucks.

$49.99

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Fleece Performance exhaust back pressure sensor wiring pigtail with color-coded leads for 2020-2024 Ford 6.7L Powerstroke

$39.99

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Fleece Performance charging circuit wiring harness with factory-style connectors for 2020-2022 Ford 6.7L Powerstroke.

$135.99

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Fleece Performance charging circuit wiring harness with factory-style connectors for 2019 Ford 6.7L Power Stroke trucks.

$135.99

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Fleece Performance charging circuit harness with factory connectors for 2017-2018 Ford Super Duty 6.7L Power Stroke

$135.99

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Fleece Performance charging circuit wiring harness with factory-style connectors for 2011-2016 Ford 6.7L Powerstroke.

$135.99

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Fleece Performance 48-inch camshaft position sensor pigtail with heat sealable connectors for Ford Powerstroke.

$37.99

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Fleece Performance fuel rail pressure sensor replacement wiring harness for 2006-2010 GM 6.6L Duramax engines.

$79.99

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Fleece Performance MAF sensor pigtail with six-inch wires and four heat-sealable butt connectors.

$29.99

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Fleece Performance fuel rail pressure harness for 2011-2016 6.6L Duramax 2500/3500 HD trucks.

$69.99

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Fleece Performance fuel pressure regulator wiring harness with specialized automotive connectors and high-temp looming.

$69.99

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Fleece Performance starter solenoid pigtail with 6-inch wiring lead and heat sealable butt-splice connector.

$35.99

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Fleece Performance turbocharger turbine speed sensor pigtail with 6-inch wires and heat-sealable butt connectors.

$36.99

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Fleece Performance neutral safety switch connector with 6-inch pigtail and heat-sealable butt-splice connectors.

$39.99

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Fleece Performance MAP sensor pigtail harness with a multi-pin connector and color-coded wire leads.

$39.99

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Fleece Performance injector connector with 6-inch pigtail wiring and heat-sealable butt connectors.

$22.99

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Fleece Performance 4-pin valve cover injector pigtail with 6-inch leads and heat-sealable butt connectors.

$29.99

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Fleece Performance cooling fan extension harness for 2019-2024 Ram 2500 and 3500 6.7L Cummins trucks.

$48.99

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Fleece Performance cooling fan extension harness for 2013-2018 Ram 2500 and 3500 6.7L Cummins diesel trucks.

$45.99

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Fleece Performance 96-pin gray ECM connector housing and terminal repair kit for 6.7L Cummins engines.

$189.00

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Green 96-pin ECM connector housing with wire terminals and seals for 6.7L Cummins engine harness.

$189.00

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Fleece Performance 96-pin brown ECM connector repair kit with wiring pigtails for 6.7L Cummins engines.

$189.00

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Fleece Performance 96-pin blue ECM connector repair kit with wiring pigtails for 6.7L Cummins engines.

$189.00

In stock
Fleece Performance cooling fan connector pigtail kit with dual connectors and six-inch flying leads for 6.7L Cummins.

$59.99

In stock
Fleece Performance 6-inch alternator pigtail with two wire leads and heat-sealable butt connectors.

$20.99

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Fleece Performance CP3 regulator extension harness with OE-style connectors for 2011-2016 GM 6.6L Duramax engines.

$29.99

In stock
Fleece Performance IAT sensor extension harness with factory-style connectors for 2013-2018 Ram 6.7L Cummins diesel engines.

$29.99

In 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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