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

LLJ Customs Car Audio Fabrication

Compression lugs for 8 Awg wire

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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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Deutsch 2 Pin Waterproof Connector Kit 16-20 Awg

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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©

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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
Low 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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Elite 2ch T-Harness Accessory

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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
Low 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

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LLJ Customs Car Audio Fabrication
Original price $255.00 USD - Original price $365.00 USD
Original price
$255.00 USD - $365.00 USD
$255.00 USD - $365.00 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

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LLJ Customs Car Audio Fabrication
Original price $210.00 USD - Original price $315.00 USD
Original price
$210.00 USD - $315.00 USD
$210.00 USD - $315.00 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

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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
Out of 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

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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 Factory Amplifier Loopback Harness Accessory

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LLJ Customs Car Audio Fabrication
Original price $245.00 USD - Original price $370.00 USD
Original price
$245.00 USD - $370.00 USD
$245.00 USD - $370.00 USD
Current price $245.00 USD
Out of 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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Ford Amp Rack F-series Pickups 55" Full wall 2015-2023

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LLJ Customs Car Audio Fabrication
Original price $175.00 USD - Original price $175.00 USD
Original price
$175.00 USD
$175.00 USD - $175.00 USD
Current price $175.00 USD
Out of stock

Our Ford amplifier racks are designed to mount into place using the factory bolts, This method of securing the ford amp rack to the back wall wi...

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Ford Amp Rack F-series Pickups 15" Driver side 2015-2023

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LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
Out of stock

Our Ford amplifier racks are designed to mount into place using the factory bolts, This method of securing the ford amp rack to the back wal...

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Ford Amp Rack F-series Pickups 24" Driver side 2017-2024

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LLJ Customs Car Audio Fabrication
Original price $110.00 USD - Original price $110.00 USD
Original price
$110.00 USD
$110.00 USD - $110.00 USD
Current price $110.00 USD
Out of stock

Our Ford amplifier racks are designed to mount into place using the factory bolts, This method of securing the ford amp rack to the back w...

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Ford Amp Rack F-series Pickups 39.75" passenger side 2015-2023

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LLJ Customs Car Audio Fabrication
Original price $130.00 USD - Original price $130.00 USD
Original price
$130.00 USD
$130.00 USD - $130.00 USD
Current price $130.00 USD
Out of stock

Our Ford amplifier racks are designed to mount into place using the factory bolts, This method of securing the ford amp rack to the back wal...

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Ford B&O subwoofer T-harness 2017-2024 R2R

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LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

Our Ford B&O T-Harness design is truly a plug and play Ford T-Harness solution that is guaranteed to deliver the signal you need when adding q...

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FORD B&O Sync3-4 Elite harness base connector 2018-2025

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LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
In stock

The Elite Ford B&O Base Connector is compatible with a range of Ford vehicles including the F250,F350, Mustang, Explorer, and more with the ...

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Ford Center dash tweeter adapter 2018-2024

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LLJ Customs Car Audio Fabrication
Original price $7.50 USD - Original price $7.50 USD
Original price
$7.50 USD
$7.50 USD - $7.50 USD
Current price $7.50 USD
Out of stock

Our Ford center speaker dash tweeter adapters give you a secure surface to mount your new aftermarket tweeter. Keep everything factory and secure w...

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FORD Sync 3 Elite harness base connector 2011-2020

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LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
In stock

Our versatile Ford Sync3 Elite Base Connector is compatible with a range of Ford Sync3 vehicles including the F150, Mustang, Explorer, and more ...

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Ford sync 3 T-harness (None amplified) R2R 2011-2020

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LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

The Ford R2R T-Harness allows you to add any aftermarket subwoofer to the ford sync system in minutes. Using the Ford T-Harness with an LOC 2ch L...

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FORD Sync 4 Elite harness base connector 2019-2025

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LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
In stock

Our versatile Ford Elite Base Connector is compatible with a range of Ford vehicles including the F250,F350, Mustang, Explorer, and more without...

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Ford Sync 4 T-harness (Non-Amplified) R2R 2018-2025

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LLJ Customs Car Audio Fabrication
Original price $80.00 USD - Original price $80.00 USD
Original price $80.00 USD
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

The Ford Sync4 T-Harness allows you to add any aftermarket subwoofer to the ford sync 4 system in minutes. Using the Ford T-Harness with a BassRE...

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GM ANC bypass harness vehicles w/ IOU,UZ6 RPO Code 2021-Up

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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

This GMC ANC bypass is for Vehicles with IOU,UZ6 RPO Code. The ANC module can be found under the center dash by the gas pedal.   GM/GMC 2020-2024 ...

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GM Bose T-harness 2013-2024 R2R

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LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

The GM Bose T-harness design lets you add a subwoofer in minutes. Our plug and play Bose T-harnesses are guaranteed to deliver the signal you need...

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GM Chevy T-harness Black/Gray Connectors 2018-2024 (Non-Amplified) R2R

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LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

Our Chevy Black/Gray T-Harness allows you to add any aftermarket subwoofer to the Chevy/GMC/Cadillac Audio system in minutes. Using the Chevy/G...

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GM/GMC ANC bypass harness (Select Vehicles) 2018-2023

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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

Our GM/GMC ANC bypass harness works for vehicles without a Bose amp or a Factory amp. This ANC bypass harness plug in at the GM ANC module. We de...

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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.