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Welcome ! Please let us know if you need any help. For other T-harness options please visit T-harness.com. Thank you
Welcome ! Please let us know if you need any help. For other T-harness options please visit T-harness.com. Thank you

Our products are NOT sold at any AUDIO SHOPS or online retailers, however knock off copies are, be aware dont pay more for less. Stay authentic 👽... Instock product ship the following business day!

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Cadillac Bose ANC bypass harness with 12+ speakers w/ RPO UQG 2021-Up

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
In stock

Cadillac Bose ANC bypass harness is a must have in any Cadillac vehicle with Bose. The Cadillac ANC bypass harness will need to be installed at the...

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Cadillac CT6 ANC bypass harness 2020-2024

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
Low stock

For Cadillac CT6 ANC ANC bypass harness. The amplifier will be located in the trunk of the car. This Cadillac ANC bypass harness is keyed and will ...

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Chevy GMC subwoofer T-harness Aqua/Tan 2019-2024 (None amplified) R2R

LLJ Customs Car Audio Fabrication
Original price $255.00 USD
Original price $255.00 USD - Original price $255.00 USD
Original price $255.00 USD
Current price $205.00 USD
$205.00 USD - $205.00 USD
Current price $205.00 USD
In stock

Chevy Aqua & Tan T-Harness allows you to add any aftermarket subwoofer to the Chevy/GMC/Cadillac Audio  system in minutes. Using the Chevy/...

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Chevy work/custom/elevation trim vehicles with 4" or 7" Screen Elite harness base connector

LLJ Customs Car Audio Fabrication
Original price $55.00 USD - Original price $55.00 USD
Original price
$55.00 USD
$55.00 USD - $55.00 USD
Current price $55.00 USD
In stock

Our 7" Chevy harness is designed to work with GM/GMC vehicles like a Traverse with a 7" screen or a Silverado with the Work Truck, Elevation or C...

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Chevy/GMC 8 inch speaker door adapter 2014-2024

LLJ Customs Car Audio Fabrication
Original price $70.00 USD - Original price $70.00 USD
Original price
$70.00 USD
$70.00 USD - $70.00 USD
Current price $70.00 USD
In stock

The first of is kind GM/GMC 8" inch speaker adapter is a perfect factory replacement. This will allow you to upgrade from the factory 6x9 speaker ...

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Chevy/GMC dash tweeter adapter 2014-2025

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
Out of stock

Our GM/GMC dash tweeter adapters give you a secure surface to mount your new aftermarket tweeter. Keep everything factory and secure, with our GM/G...

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Chevy/GMC door speaker harness adapter 2014-25

Shock-Wire
Original price $3.75 USD - Original price $14.75 USD
Original price
$3.75 USD - $14.75 USD
$3.75 USD - $14.75 USD
Current price $3.75 USD
In stock

Inspired by the 72-4572 door speaker harness our GM/GMC speaker adapter harness makes installing aftermarket speakers easy at an appropriate price....

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Chevy/GMC tweeter harness adapter 2.75" 2019-25

Shock-Wire
Original price $3.75 USD - Original price $14.75 USD
Original price
$3.75 USD - $14.75 USD
$3.75 USD - $14.75 USD
Current price $3.75 USD
In stock

Inspired by the 72-4573 adapter harness our GM/GMC speaker adapter harness makes installing aftermarket speakers easy at an appropriate price. This...

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Chevy/GMC Tweeter Harness Adapter 2002-18

Shock-Wire
Original price $3.75 USD - Original price $14.75 USD
Original price
$3.75 USD - $14.75 USD
$3.75 USD - $14.75 USD
Current price $3.75 USD
In stock

Inspired by the 72-4568 adapter harness our GM/GMC speaker adapter harness makes installing aftermarket speakers easy at an appropriate price. This...

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Chevy/GMC Tweeter Harness Adapter 2012-19

Shock-Wire
Original price $3.75 USD - Original price $14.75 USD
Original price
$3.75 USD - $14.75 USD
$3.75 USD - $14.75 USD
Current price $3.75 USD
In stock

Inspired by the 72-4574 adapter harness our GM/GMC tweeter adapter harness makes installing aftermarket dash speakers easy at an appropriate price....

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Chrysler | Dodge | Ram | Jeep Factory PRE AMP Audio harness for 2015-2024

LLJ Customs Car Audio Fabrication
Original price $75.00 USD - Original price $75.00 USD
Original price
$75.00 USD
$75.00 USD - $75.00 USD
Current price $75.00 USD
In stock

This audio harness is designed to work with the Alpine, Harmon Kardon factory amplified system. It will bypass the ANC and will only work with ve...

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Compression lugs for 0/1 Awg wire

LLJ Customs Car Audio Fabrication
Original price $2.25 USD - Original price $2.25 USD
Original price
$2.25 USD
$2.25 USD - $2.25 USD
Current price $2.25 USD
In stock

Compression lugs are designed to terminate copper conductors. Each lug is electro-tin plated to resist corrosion. Ferrules Direct compression lugs ...

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Compression lugs for 4 Awg wire

LLJ Customs Car Audio Fabrication
Original price $2.25 USD - Original price $2.25 USD
Original price
$2.25 USD
$2.25 USD - $2.25 USD
Current price $2.25 USD
In stock

Compression lugs are designed to terminate copper conductors. Each lug is electro-tin plated to resist corrosion. Ferrules Direct compression lugs ...

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Compression lugs for 8 Awg wire

LLJ Customs Car Audio Fabrication
Original price $1.05 USD - Original price $1.05 USD
Original price
$1.05 USD
$1.05 USD - $1.05 USD
Current price $1.05 USD
In stock

Compression lugs are designed to terminate copper conductors. Each lug is electro-tin plated to resist corrosion. Ferrules Direct compression lugs ...

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Custom RCA Cables Shock-Wire©

Shock-Wire
Original price $30.00 USD - Original price $30.00 USD
Original price
$30.00 USD
$30.00 USD - $30.00 USD
Current price $30.00 USD
In stock

When it comes to RCA cables there is a plenty of fish in the sea but some fish just taste better than others and that is the case here. Our In-hous...

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Deutsch 2 Pin Waterproof Connector Kit 16-20 Awg

LLJ Customs Car Audio Fabrication
Original price $6.99 USD - Original price $6.99 USD
Original price
$6.99 USD
$6.99 USD - $6.99 USD
Current price $6.99 USD
In stock

Deutsch 2 Pin Waterproof Plug Kit with crimpling tool (if selected)  For 16-20 Awg wire. Comes with connector housing Set pin and lock tab. Crimpin...

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Double ANL Under-hood Fuse holder mounts©

LLJ Customs Car Audio Fabrication
Original price $23.00 USD - Original price $23.00 USD
Original price
$23.00 USD
$23.00 USD - $23.00 USD
Current price $23.00 USD
Out of stock

Our ABS ANL Fuse Mounts are available with and without the T-Spec Fuse holders and come with hardware if you chose no fuse holder so you can mount ...

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DSR1

Rockford Fosgate
Original price $330.00 USD - Original price $330.00 USD
Original price
$330.00 USD
$330.00 USD - $330.00 USD
Current price $330.00 USD
Low stock

The DSR1 is the first real solution for replacing the factory amplifier and speakers in Ford and Chrysler vehicles, as the DSR1 uses the full-range...

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Elite 2ch T-Harness Accessory

LLJ Customs Car Audio Fabrication
Original price $30.50 USD - Original price $92.00 USD
Original price
$30.50 USD - $92.00 USD
$30.50 USD - $92.00 USD
Current price $30.50 USD
In stock

The Elite 2 Channel T-Harness Accessory is the option needed when installing a mono amp and subs. This will offer signal, power and ground to the L...

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Elite 4ch OEM Loopback Harness Accessory

LLJ Customs Car Audio Fabrication
Original price $255.00 USD - Original price $340.00 USD
Original price
$255.00 USD - $340.00 USD
$255.00 USD - $340.00 USD
Current price $255.00 USD
In stock

Introducing our Elite Loopback Harness Accessory: The Seamless Solution for Adding a 4+ Channel Amp to Your Speaker System! Are you looking to upgr...

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Elite 4ch OEM Loopback Harness Accessory NO unit

LLJ Customs Car Audio Fabrication
Original price $210.00 USD - Original price $285.00 USD
Original price
$210.00 USD - $285.00 USD
$210.00 USD - $285.00 USD
Current price $210.00 USD
In stock

Introducing our Elite Loopback Harness Accessory: The Seamless Solution for Adding a 4/6/8+ Channel Amp to Your Speaker System! Are you looking to ...

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Elite 4ch T-Harness Accessory Options

LLJ Customs Car Audio Fabrication
Original price $45.00 USD - Original price $45.00 USD
Original price
$45.00 USD
$45.00 USD - $45.00 USD
Current price $45.00 USD
In stock

The Elite 4 Channel T-Harness Accessory is the option needed when installing a mono amp and subs. This will offer signal, power and ground to the L...

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Elite AROA© Harness

LLJ Customs Car Audio Fabrication
Original price $25.00 USD - Original price $25.00 USD
Original price
$25.00 USD
$25.00 USD - $25.00 USD
Current price $25.00 USD
In stock

Adding an aftermarket radio to your factory system that was previously upgraded with our Elite Loopback Harness, is an absolute breeze withe the El...

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Elite Bose amplifier Loopback Harness Accessory (No unit)

LLJ Customs Car Audio Fabrication
Original price $175.00 USD - Original price $270.00 USD
Original price
$175.00 USD - $270.00 USD
$175.00 USD - $270.00 USD
Current price $175.00 USD
Low stock

The Elite 6ch Bose Loopback Harness Accessory was specifically designed to work and plug into the factory amplifier, making the process of installi...

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Industry leaders or thieves?

Stolen designs

For years people like CAF and 5STAR said you HAD to pull new speaker wire, then we showed up and now they say loops are the way. Don't trust people who copy others and try to take credit.

The year was 2018

Before the solutions were even needed we had them. It wasn't until 2022 that PAC Audio and Metra would have to backstep and steal our design to stay in the game.

The SCAM that is PAC Audio

The amp-pro was PACs first try to steal our ideas. It failed so bad they had to steal our ANC bypasses to make the amp-pro (2019) work better. (pic taken 2017)

12v Knowledge block

What Is "High Level" or "Low level" ?

What Is "High Level" or "Low level" ?

High level: AKA Speaker level is an amp that can handle an input voltage of 8-40v. This high output is common in factory amplified vehicles or where the
max voltage of a head unit is more than 10v. This is normally identified by a pigtail connection point or via the RCA on the amplifier (must check user manual to verify). Some amps have a switch for this. NOT all amps have this feature.

Low Level: is 0-8v of signal voltage. This is most commonly found in aftermarket head units or other aftermarket units that use can-bus. Most passive LOC units output 0-5v, so they are considered a low level and are normally RCA to RCA. Modern day ACTIVE LOC units can output 0-10v of signal.

In conclusion an LOC works as an in-line filter that lets you control the signal, its intensity and in some cases the playable frequency range.

If your amp takes a high level and it is within the vehicles factory output range then you don't need an loc unit and can wire in and out of your amp directly. In some Fords the signal can be flattened at the OBD2, further simplifying the installation.

Wavtech Units

Automotive Amp Racks

We created the Automotive Amp Rack

We created the Automotive Amp Rack

to give customers a secure place to mount their equipment without damaging their vehicles and having the ability to build and test everything outside of the vehicle. Choosing durable materials like ABS, HDPE, Acrylic and always using factory bolts was our mission.

This product has now turned into an upsell by shops and copy-cats like 5star and car audio fabrications on YouTube to be sold as some type of beauty product. Shops are using cheap materials like expanded PVC board and charging customers a premium price for doing something they should have been doing all along. Your choices are get robbed, or screw holes and water leaks.

They do not represent what our products are and we don't appreciate the theft of our products and ideas being used to steal from customers.