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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SPAL SBL-TS-HARN-PKG jumper harness for brushless fans featuring automotive-grade wiring and sealed connectors.
$41.86 $62.57
-33%
In stock
Rywire 4-wire oxygen sensor extension harness with factory-style connectors for 2007+ Honda and Acura vehicles.

$30.00

Low in stock
Haltech HT-140843 plug-and-play adaptor harness for Honda S2000 AP1 and Elite 1000/1500 ECUs

$495.00

In stock
Tazer OBDII T-Harness with male and female diagnostic connectors for 2005-2017 FCA vehicles

$28.95

In stock
Authentic GReddy logo badge for Nissan 180SX intake manifold surge tank.
$20.90 $22.00
-5%
Low in stock
Fleece Performance NSBU replacement connector set with 6-inch wire pigtails and heat-seal butt connectors.

$79.99

In stock
Fleece Performance fuel rail pressure sensor pigtail with wiring harness and heat-sealable butt connectors.

$56.99

In stock
Haltech Elite 2500 premium universal wiring harness with integrated fuse box, relays, and rubber firewall grommet.

$520.00

In stock
Westin black front parking sensor relocator kit with 20-gauge pigtails, electrical connectors, and mounting hardware.
$107.99 $135.00
-20%
In stock
Torque Solution plug-and-play hybrid speed density adapter harness with factory-style connectors for Subaru WRX and STI

$94.43

Low in stock
Rywire K-Series naturally aspirated engine harness for Haltech Elite 1500 showing mil-spec wiring and connectors.

$1,749.00

Low in stock
Haltech NEXUS S2/S3 2.5M (8ft) universal wire-in harness kit with terminated connectors and color-coded flying leads.

$405.00

Low in stock
Ford Racing engine harness for Gen 2 5.0L Coyote engines with 6R80 automatic transmission connector.

$285.00

Low in stock
Fleece Performance universal rail pressure sensor pigtail harness with 6 inch wires and heat-sealable connectors.

$25.99

In stock
Fleece Performance 6-inch sensor pigtail harness with a high-quality connector and pre-stripped wire leads.

$28.99

In stock
Fleece Performance 36-inch universal pressure sensor pigtail with 3-pin connector and wire leads.

$24.99

In stock
Fleece Performance 2-pin universal sensor pigtail with 6-inch wire leads and heat-sealable butt connectors.

$19.99

In stock
Fleece Performance 6-inch multiuse sensor pigtail connector for 1995-2020 Dodge and Ram Cummins engines.

$29.99

In stock
Fleece Performance 6-inch replacement electrical connector pigtail with wire leads for Dodge Ram Cummins sensors.

$32.99

In stock
Fleece Performance fuel sending unit connector with 6-inch pigtail and three heat-sealable butt-splice connectors.

$27.99

In stock
Fleece Performance No. 10 multi-use sensor pigtail with 6-inch wire leads and two-pin electrical connector.

$14.99

In stock
Fleece Performance 6-inch MOPAR pressure sensor pigtail with wiring for 2002-2009 Dodge Ram trucks.

$27.99

In stock
Fleece Performance heated seat module wiring pigtail with multi-pin connector and heat-shrink butt connectors

$56.99

In stock
Fleece Performance 6-inch NSBU pigtail harness with heat-sealable butt connectors for 2004-2005 GM Allison transmissions.

$69.99

In stock
20-pin GM automatic transmission wiring pigtail with 12-inch labeled leads and heat-sealable butt connectors.

$99.99

In stock
Fleece Performance Water-In-Fuel sensor pigtail with 6-inch wiring leads and heat-shrink butt connectors for Ford trucks.

$29.99

In stock
Fleece Performance fuel lift pump pigtail with pre-stripped wire leads and waterproof heat-shrink connectors.

$38.99

In stock
Fleece Performance fuel lift pump pigtail harness with two heat-sealable butt connectors for 2011-2016 Ford 6.7L Powerstroke.

$38.99

In stock
Fleece Performance turbo vane position sensor adapter harness for 2004-2005 GM 2500/3500 LLY Duramax engines.

$46.99

In stock
Fleece Performance 6-inch sensor pigtail connector for 2001-2007 GM 6.6L Duramax MAP, BARO, cam, and crank sensors.

$27.99

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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