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Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit T-harness.com. Thank you
Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit T-harness.com. Thank you
Factory System integration Harnesses

Factory System integration Harnesses

Looking for a simple way to add subs to your vehicle but you're not sure on what you need? Check out this quick overview!

GM/GMC Bose amplifier harness Base connector 2014-2019

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 Bose amplifier harness is designed to work with a variety of GM/Cadillac vehicles from a Silverado, Escalade, Sierra and any GM vehicle with...

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2014-2018 GM/GMC vehicles with 8" or select 4" screen's (Without Bose) Base Connector

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 8" screen GM/GMC harness is designed to work with a variety of vehicles from a Silverado, Sierra, Suburban and any other GM vehicles that use ...

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GM/GMC Bose amplifier harness base Connector 2019-2025

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

The Bose amplifier harness is designed to work with a variety of GM/Cadillac/GMC and Buick vehicles from a Silverado, Escalade, Sierra and any G...

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GM/GMC/Cadillac Aqua & Tan (Without Bose amp) Base Connector 2019-2025

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 2019-2025 GM/GMC/Cadillac Aqua & Tan Elite Harness has been tested, redesigned and modified to what it is now by our team at LLJ Customs....

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GM/GMC/Cadillac Black & Gray (Without Bose amp) Base Connector 2019-2025

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 2019-2022 GM/GMC Black & Gary connector Elite Harness has been tested, redesigned and modified to what it is now by our team at LLJ Customs...

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Uconnect4 RAM JEEP Elite harness base connector 2013-2022

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 RAM JEEP Uconnect4 Elite Base Connector is compatible with a range of RAM JEEP vehicles including the RAM pickup, wrangler sport, Ra...

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FORD Sync 3 Elite harness base connector 2011-2020

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 4 Elite harness base connector 2019-2025

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

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

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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Uconnect5 RAM JEEP Elite harness base connector 2022-2025

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 RAM JEEP Elite Base Connector is compatible with a range of RAM JEEP vehicles including the RAM pickup, wrangler sport, Wagoneer, and...

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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.