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Current Performance Wiring is proud to be of service since 1999
6330 Pine Hill Rd #16 • Port Richey, FL 34668

Built From Scratch Engine Management Harness


The above harness is an LS1 stand alone harness with 4' length to the computer.

An engine management harness is pretty much what you will find from most wiring harness companies. Basically, it contains all of the necessary functions to make the engine start and run, while also supplying any necessary signals from the computer such as speedometer and tachometer.

Our engine management harness contains any fuses and relays that will be needed, and the required splicing on the consumer's end of it is fairly basic. There are no main power feeds required for this harness, just a single switched ignition power will switch a relay in the harness that in turn, supplies 12V power to all of the required engine sensors and the ECU.

These harnesses are designed for the hot rod, or project car that will be using aftermarket or mechanical gauges. There is no wiring for oil or temperature gauges since the aftermarket usually supplies sending units and wiring for these.

All of our harnesses, whether it is a complete custom harness, or our engine management harness, come with an easily accessible DLC (Data Link Connector) that is usually long enough to be mounted in the passenger compartment. This allows for easy access to the ECU via a laptop or standard scan tool.

 

 

Harnesses come covered in standard OE split loom
Optional braided loom available for an extra charge

 

The Fuses and Relays for custom harnesses can come one of 2 ways. Either the standard separation of all relays where they are mounted in the engine compartment usually on the firewall or fender, or a compact OEM looking Fuse/Relay center where all of the components are in one central location. The fuse/relay center style is shown below. All of the fuses and relays are labeled on the underside of the covers just like a factory vehicle.

For LS2 Engine Harnesses click here

LT1, LS1, Vortec, LS2 (using LS1 computer) Engine Management Harness
designed for a simple engine installation
*Ask about our sensor package including MAF and O2 sensors for a complete matched system.

 

The Bare Bones

Basic cable throttle engine management harness. This is designed to run an engine only. Good for sandrails, street rods, boats, or anything that just needs the engine to run with minimal other options. Available with 4L60E transmission upgrade. This kit includes a single fuse/relay block with fuses for the engine and a fuel pump relay.
Option also available
to add 2 fan relays pre-installed in the harness and computer controlled.

LT1-$525

LS1/Vortec - $550
On Sale Starting at $495.00
Harness options
 

The Bare Bones
Electronic Throttle

Basic electronic throttle (8 pin throttle body, Blue/Green ECU) truck engine management harness. This is designed to run an engine only. Good for sandrails, street rods, boats, or anything that just needs the engine to run with minimal other options. Available with 4L60E or 4L80E transmission upgrade. This kit includes a single fuse/relay block with fuses for the engine and a fuel pump relay.
Option also available
to add 2 fan relays pre-installed in the harness and computer controlled.

Vortec Truck ETC - $575
On Sale Starting
at $525.00
Harness Options
 
Custom Engine Management Harnesses available
Includes Basic relays and fuses to make the engine run.
(i.e. Fuel Pump, Starter, Ignition Power relays, and fuses for engine)
Stage 1 Engine Management Harness up to 5' to computer
LT1-$595
LS1-$650
   
Stage 1 Engine Management Harness 5.5' to 10' to computer LT1-$675
LS1-$725
Stage 2 Engine Management Harness
 
Adds A/C and Electric Fan wiring as well as all needed relays and fuses.
(Can be wired for computer control or manual switch for fans)
Stage 2 Engine Management Harness up to 5' to computer
LT1-$650
LS1-$725
   
Stage 2 Engine Management Harness 5.5' to 10' to computer LT1-$750
LS1-$799

LS1 Computer Programs starting at $175
LT1 Computer Programs starting at $315
VATS Bypass module added for additional $35 (Not needed with programming)
   

Modification of Stock Engine Harness

If you bought an engine that came with a wiring harness on it, and you feel that the length of the harness to the ECU, and the look of the harness will work fine for your project, than we can simply modify it to be a stand alone engine management harness. This means that we take the harness that you supply, and add all of the required fuses and relays in a simple relay center that mounts near the ECU under the hood. The relay center contains all of the fuses for the harness and any relays that are needed such as ignition power, starter, and Fuel pump. We remove any unnecessary wiring such as emissions controls and O2 sensors that may not be used.

This harness modification does not eliminate VATS or emissions controls in the ECU. This must be done in the programming, or else a VATS module needs to be installed in the harness for an additional charge.

We have partnered with Fastchip to create custom programs for the LT1 and LS1 engines that will give the best performance and eliminate all of the unnecessary parts of the programming such as emissions controls, O2 sensors, air pump, VATS, etc.
Example of LT1 harness modified to stand alone shown below.

LT1, LS1, Vortec Engine Harness Modification

For LS2 Engine Harnesses click here

Stage 1 Engine Harness Modification
Includes Basic relays and fuses to make the engine run.
(i.e. Fuel Pump, Starter, Ignition Power relays, and fuses for engine)
$375
   
Stage 2 Engine Harness Modification
 
Adds A/C and Electric Fan wiring as well as all needed relays and fuses.
(Can be wired for computer control or manual switch for fans)
$450

LS1 Computer Programs starting at $175
LT1 Computer Programs starting at $315
VATS Bypass module added for additional $35 (Not needed with programming)

The Fuses and Relays for custom harnesses can come one of 2 ways. Either the standard separation of all relays where they are mounted in the engine compartment usually on the firewall or fender, or a compact OEM looking Fuse/Relay center where all of the components are in one central location. The fuse/relay center style is shown below. All of the fuses and relays are labeled on the underside of the covers just like a factory vehicle.

   

All of the Engine Management Harnesses come with wires that need to be wired in to the vehicle. Any wires that are loose are labeled and instructions are always included describing where the wires need to be connected.
These wires may include:
A simple 12V switched source
Check Engine Light
Speedometer
Tachometer
A/C Compressor
Park/Neutral for ECM
Starter relay signal
Fuel Pump Power
Brake switch signal

© 2011 Current Performance Wiring

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