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Custom 4U Stand Alone LS2 LS7 GM engine wiring harness

Custom 4U Stand Alone LS2 LS7 GM engine wiring harness

Your Price:$784.75
Retail Price:$871.95
Your Savings:$87.20(10%)
In Stock
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Part Number:1285
Stand Alone
LS2 / LS7 Engine Management
Wiring Harness


Harness is custom made for use on LS2 / LS7 motors. This AN ALL INCLUSIVE HARNESS and is brand new and built from scratch to your specifications. Comes with 4ft of length from the engine to the ECM and Fuse Block, ECM is shown in image BUT NOT provided.

As purchased, will use a LS2 ECU, and have connectors for the Throttle By Wire foot pedal.

Although can be custom built for you to use a LS1 ECU to run the LS2 mtoor with a LS1 Cable Throttle if preferred over Throttle By Wire (No additional cost)

Professionally built to exceed OEM Standards. Not a simple bypass, but a complete stand alone engine management system harness, includes harness for transmission (Specify Manual or Automatic when ordering price is the same). VATS ( Vehicle Anti-Theft System ) will require using the supplied VATS wire and separate VATS bypass module or reprogramming of the ECU.

As these are custom harnesses, expect 2 - 4 weeks (Approximately 20 business days) for harness to ship. Contact us if you have a rush and
we can see if we can fit it in.

No Previous Wiring or
Electrical Experience Necessary
Just plug it in, and make the labeled
connections it is really that simple

Additional customization and/or add-ons available:

  • ECU Computer reprogramming (Inquire for quote - ECU not provided)
  • Coil relocation kit (For hiding coils out of view) - Add $65
  • Additional Length from Engine to ECM - Inquire
  • Can be Customized to run a LS2 crate motor with a LS1 ECU & Cable Throttle
  • Other special customizations available - Inquire



  • Includes VATS module & bypass wire

  • LS2 mini-harness for using LS2 Intake and throttle body

  • LS2 mini-harness and injector plugs for using LS2 Intake

  • Plugs & Connectors for using LS2 Throttle By Wire.
Harness Features:
  • Harness is designed to work on a 04 - 06 LS2 or LS7 motors

  • Harness is 100% complete
    All OEM GM Connectors, not replicas or cheap copies

  • All relays and fuses are included

  • Covered with split loom just like factory

  • Only High Quality GXL wire used for protection from heat.

  • Contains all of the necessary wiring, connectors and plugs for:
    • OBDII Plug
    • Injectors
    • Sensors
    • Ignition
    • A/C compressor
    • Starter
    • High and Low speed Electric fans
    • Fuel Pump
    • Throttle by Wire
    • VATS

  • O2 sensors relocated from factory harness design to work with either the stock manifolds, shorty headers, or long tube headers, specify after purchasing (no extra cost).

  • Fuses and Relays for:
    • A/C compressor
    • Fuel Pump
    • ECM, Coils & Injectors
    • MAF
    • O2 sensors
    • Transmission including Back-up Lamps

  • Wires to be spliced in from the body harness are all labeled and are:
    • Transmission
    • Speedo
    • Tach
    • Fuel Pump
    • Cranking signal to starter
    • Back-up Lamps
    • 12V switched ignition
    • Check Engine lamp
    • A/C Request
    • VATS
    • Electric Fans 1 & 2.

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