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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
Text/Call (602) 320-7004 Email: Support@lljcustoms.com

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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Custom RCA Cables Shock-Wire©

Shock-Wire
$30.00 USD - $30.00 USD
$30.00 USD
$30.00 USD - $30.00 USD
$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
$6.99 USD - $6.99 USD
$6.99 USD
$6.99 USD - $6.99 USD
$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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DSR1

Rockford Fosgate
$330.00 USD - $330.00 USD
$330.00 USD
$330.00 USD - $330.00 USD
$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
$30.50 USD - $92.00 USD
$30.50 USD - $92.00 USD
$30.50 USD - $92.00 USD
$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
$255.00 USD - $340.00 USD
$255.00 USD - $340.00 USD
$255.00 USD - $340.00 USD
$255.00 USD
Low 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
$210.00 USD - $285.00 USD
$210.00 USD - $285.00 USD
$210.00 USD - $285.00 USD
$210.00 USD
Low 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
$45.00 USD - $45.00 USD
$45.00 USD
$45.00 USD - $45.00 USD
$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
$25.00 USD - $25.00 USD
$25.00 USD
$25.00 USD - $25.00 USD
$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
$175.00 USD - $270.00 USD
$175.00 USD - $270.00 USD
$175.00 USD - $270.00 USD
$175.00 USD
In 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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Elite Bose Factory Amplifier Loopback Harness Accessory

LLJ Customs Car Audio Fabrication
$180.00 USD - $280.00 USD
$180.00 USD - $280.00 USD
$180.00 USD - $280.00 USD
$180.00 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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Save $50.00 USD Save $0.00 USD

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

LLJ Customs Car Audio Fabrication
$255.00 USD
$255.00 USD - $255.00 USD
$255.00 USD
$205.00 USD
$205.00 USD - $205.00 USD
$205.00 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

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$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 Sync 3 Elite harness base connector 2011-2020

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$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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Save $50.00 USD Save $0.00 USD

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

LLJ Customs Car Audio Fabrication
$255.00 USD
$255.00 USD - $255.00 USD
$255.00 USD
$205.00 USD
$205.00 USD - $205.00 USD
$205.00 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

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$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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Save $50.00 USD Save $0.00 USD

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

LLJ Customs Car Audio Fabrication
$255.00 USD
$255.00 USD - $255.00 USD
$255.00 USD
$205.00 USD
$205.00 USD - $205.00 USD
$205.00 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

LLJ Customs Car Audio Fabrication
$15.00 USD - $15.00 USD
$15.00 USD
$15.00 USD - $15.00 USD
$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 2013-2025 R2R

LLJ Customs Car Audio Fabrication
$255.00 USD
$255.00 USD - $255.00 USD
$255.00 USD
$205.00 USD
$205.00 USD - $205.00 USD
$205.00 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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Save $50.00 USD Save $0.00 USD

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

LLJ Customs Car Audio Fabrication
$255.00 USD
$255.00 USD - $255.00 USD
$255.00 USD
$205.00 USD
$205.00 USD - $205.00 USD
$205.00 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 Bose amplifier harness Base connector 2014-2019

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$60.00 USD
Low 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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GM/GMC Bose amplifier harness base Connector 2019-2025

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$60.00 USD
In 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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Save $50.00 USD Save $0.00 USD

GM/GMC T-harness with 8" or select 4" screen's (Without Bose) R2R 2014-2018

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

The Chevy/GMC R2G T-Harness allows you to add any aftermarket subwoofer to the Chevy/GMC system in minutes. Using the Chevy/GMC T-Harness with an...

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Save $50.00 USD Save $0.00 USD

GM/GMC Work/Custom/Elevation trim Vehicles with 4" or 7" Screen 2014-2019 R2R

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

The Chevy work/elevation trim R2R T-Harness allows you to add any aftermarket subwoofer to the Chevy work/elevation trim system in minutes. Usi...

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

LLJ Customs Car Audio Fabrication
$60.00 USD - $60.00 USD
$60.00 USD
$60.00 USD - $60.00 USD
$60.00 USD
In 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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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

The best in hand Made RCA's & Power kits

Custom RCA Cables Shock-Wire©

Shock-Wire
$30.00 USD - $30.00 USD
$30.00 USD
$30.00 USD - $30.00 USD
$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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Sold out

1ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$20.00 USD - $20.00 USD
$20.00 USD
$20.00 USD - $20.00 USD
$20.00 USD
Out of 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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3ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$41.00 USD - $41.00 USD
$41.00 USD
$41.00 USD - $41.00 USD
$41.00 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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12ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$75.00 USD - $75.00 USD
$75.00 USD
$75.00 USD - $75.00 USD
$75.00 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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6ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$55.00 USD - $55.00 USD
$55.00 USD
$55.00 USD - $55.00 USD
$55.00 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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Sold out

Thunder wire 1/0 AWG 22' Power Kit

Shock-Wire
$265.00 USD - $265.00 USD
$265.00 USD
$265.00 USD - $265.00 USD
$265.00 USD
Out of stock

Made in the, USA  -100% OFC large strand copper - K-type build to spec safe a 10,000 amps  - Kits come in 22'  foot length -Hydraulic crimped  -Thi...

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16ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$89.00 USD - $89.00 USD
$89.00 USD
$89.00 USD - $89.00 USD
$89.00 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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20ft 2ch Shock-Wire© Audiophile RCA Cable

Shock-Wire
$115.00 USD - $115.00 USD
$115.00 USD
$115.00 USD - $115.00 USD
$115.00 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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Thunder Wire 1/0 AWG Per Foot- Transparent

Shock-Wire
$6.50 USD - $6.50 USD
$6.50 USD
$6.50 USD - $6.50 USD
$6.50 USD
In stock

Sold by the foot ! Made in the, USA  -100% OFC large strand copper - K-type build to spec Safe at 10,000 amps - Wire will be cut to the total lengt...

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Shop collection

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.

Automotive Amp Racks

Silverado pickup amp rack 2014-2019 18"

LLJ Customs Car Audio Fabrication
$60.00 USD - $70.00 USD
$60.00 USD - $70.00 USD
$60.00 USD - $70.00 USD
$60.00 USD
In stock

The Silverado/Sierra Pick-up amp racks are not just the first of their kind ,they are also the best. Our amp racks are designed to fit into place,...

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Silverado pickup amp rack 2014-2019 28"

LLJ Customs Car Audio Fabrication
$110.00 USD - $125.00 USD
$110.00 USD - $125.00 USD
$110.00 USD - $125.00 USD
$110.00 USD
Low stock

Our Silverado/Sierra Pick-up amp racks are not just the first of their kind ,they are also the best. Our amp racks are designed to fit into place,...

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Sold out

Silverado pickup amp rack 2014-2019 37"

LLJ Customs Car Audio Fabrication
$135.00 USD - $145.00 USD
$135.00 USD - $145.00 USD
$135.00 USD - $145.00 USD
$135.00 USD
Out of stock

The Silverado/Sierra Pick-up amp racks are not just the first of their kind ,they are also the best. Our amp racks are designed to fit into place,...

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Silverado pickup amp rack 2014-2019 48"

LLJ Customs Car Audio Fabrication
$150.00 USD - $160.00 USD
$150.00 USD - $160.00 USD
$150.00 USD - $160.00 USD
$150.00 USD
In stock

Our Pick-up truck amp racks are not just the first of their kind ,they are also the best. Our amp racks are designed to fit into place, mounting o...

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GMC Sierra Amp Rack pickup 28" 2019-2025

LLJ Customs Car Audio Fabrication
$65.00 USD - $75.00 USD
$65.00 USD - $75.00 USD
$65.00 USD - $75.00 USD
$65.00 USD
In stock

Our GMC pickup amp racks are the best solution for properly and easily securing your aftermarket equipment to you vehicle. Our amp racks are d...

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Silverado pickup amp rack with Bose 2014-2019 48"

LLJ Customs Car Audio Fabrication
$150.00 USD - $160.00 USD
$150.00 USD - $160.00 USD
$150.00 USD - $160.00 USD
$150.00 USD
In stock

The Silverado/Sierra Pick-up amp racks are not just the first of their kind ,they are also the best. Our amp racks are designed to fit into plac...

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GMC Sierra Amp Rack pickup 10.5" 2019-2024

LLJ Customs Car Audio Fabrication
$35.00 USD - $45.00 USD
$35.00 USD - $45.00 USD
$35.00 USD - $45.00 USD
$35.00 USD
In stock

The Sierra pickup amp racks are the best solution for properly and easily securing your aftermarket equipment to you vehicle. Our amp racks are ...

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Automotive Amp Rack 2019-2022 Silverado Sierra rear under seat

LLJ Customs Car Audio Fabrication
$80.00 USD - $80.00 USD
$80.00 USD
$80.00 USD - $80.00 USD
$80.00 USD
In stock

This amp rack is mounted under the rear driver side below the rear seat. It uses the lowering jack equipment holder bolt. This custom cut amp rack ...

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