Our Direct-Fit custom wiring harnesses are plug-and-play, custom built, and designed specifically for your project utilizing a 97-up LSx or Vortec small block. Each harness is built from scratch specifically for your engine and vehicle combination. In most cases a Direct-Fit harness will allow you to retain all of the factory vehicle functions and gauges when doing an engine swap.
Looking for readily available more basic solution? See our inventory Standalone LS Swap Wiring Selections
The main difference between our Direct-Fit custom harnesses and a standalone engine management harness is that the custom harness is exactly that… meaning it is built custom for your application. The standalone engine management harness is cheaper because it is designed to do nothing except run the engine, and supply any necessary signals such as speedometer and tachometer. The custom harness is built to include all of the functions that your vehicle will use, such as any factory gauges that can be used, any connectors that go to or through the firewall, relays to control the fans via the computer, and we will utilize the factory Neutral Safety switch if possible.
A Direct-Fit custom harness from Current Performance Wiring contains all of the electrical connections that are required for the vehicle that the engine is being installed in. These harnesses include relays for the fuel pump, starter, fans, A/C, etc. All fuses that are not in the vehicle already are included in the complete custom harnesses as well.
This harness is not only designed to plug right in to the project vehicle and engine, but since they are completely built from scratch, they can be made to your specs. If you are going for a clean install and want the ECU inside the passenger compartment, or all the way back in the trunk, we can make it exactly how you need.
Direct-Fit Custom Harnesses come covered in standard OE split loom but optional Braided loom is available for an extra charge.
This is an example of a Complete Custom Harness built from scratch for a 1992 Chevy Full Size Chevy P/U getting a 6.0 LQ9 engine installed using the 5 speed transmission from the 1992 truck. Also prepped for Electric Fans.
This is a Harness built from scratch for a 2001 Silverado getting a Corvette LS1. The truck had a 4.8, so the customer could have used the 4.8 harness modified with the proper injector plugs. However, the 4.8 wiring goes over the intake, and comes out the side to the computer, which is not the look this person wanted. So a new harness was built and routed so all the wiring will be hidden under the Corvette injector covers on the LS1 engine, and the wiring over to the computer goes around the engine compartment so it looks much cleaner under the hood.
This is an example of a Direct-Fit custom harness built for an LS3 installed into a 1996 Impala SS. The original harness from the 96 Impala was shipped to us and was used as a template for building the new harness to fit the car. Some of the components of the original wiring, like the ABS and fuse block were kept and transplanted in to the new wiring. This system was built for an LS3 and 4L85E swap, and intended to retain all of the factory functions of the original vehicle.
Vehicles we offer LSx, LT/Vortec Direct fit harnesses for
- 1982-1997 Chevy S10/ Blazer, GMC Sonoma / S-15/ Jimmy
- 1998-2004 Chevy S10/Blazer, GMC Sonoma/Jimmy
- 1994-1996 Chevy Impala, Caprice, Road master *
- 1992-2007 Chevy/GMC Sivlerado / Sierra, Suburban, Tahoe / Yukon) (1500,2500,3500,Diesel)*
- 1985- 1996 Chevy Corvette *
- 1994-2002 Chevy Camaro, Pontiac Fire Bird / Trans AM
- 2008-2012 Chevy Colorado , GMC Canyon
- 2015-up Colorado / Canyon
- 2008-2010 Hummer H3 *