Stand Alone Engine Harness
Stand Alone Engine Harness FuseBox_Close Labels GM Vortec 5.3 Engine


Note: This harness is for Electronic Throttle body (drive-by-wire) truck intake applications only.

Electronic throttle (8 pin throttle body, Blue/Green ECU) truck engine management harness.

  • Our stock harnesses are 4 feet from the rear of engine passenger side.
  • All harnesses are configured with 5 wire MAF connectors intended to work with MAF p/n AF10043 or equivalent
  • Available options Transmission, Electric Fans, Air conditioning and Upgraded Braided loom.

Please call for custom ECM and/or Fuse Box Location,  extra Length.

**Online Harness orders ship with in 1-3 business days**

Built From Scratch Stand Alone Engine Harness

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.

Harness Loom Options

Harnesses come covered in standard OE split loom.

Optional braided loom available for an extra charge.

Fuses & Relays

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 here. All of the fuses and relays are labeled on the underside of the covers just like a factory vehicle.

Additional information

Weight 8 lbs
Dimensions 12 × 12 × 8 in
Transmission Type

None/Non-Electronic, 4L60E, 4L80E, T56

2 Fans

No, Yes

Air Conditioning

Yes, No

Braided Loom

Yes, No


This Harness Fits V8 Engines out of These Vehicles with Electronic Throttle Body

LR4 applications:

LM7 applications:

L59 applications:

LM4 applications:

L33 applications:

LQ4 (VIN U) Applications:

LQ9 (VIN N) Applications:


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