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

Wire Harness diagrams and how to's

Creating solutions like T-harness and OEM loopback harnesses was easy. Understanding just how simple our Elite T-harness and OEM loopbacks really are is another deal and with this page we hope to simplify your understanding and build your confidence in taking on your car audio project to the next level. Our elite system we stolen by PAC Audio and our ANC harnesses used to make their amp pros work properly same for Metra. So why pay a shop to overcharge you for stolen products you can install your self? 

Trusted brands that are Original

T-harness with High level input AMP

T-harness with High level Mono amplifier

T-harness with High level Mono amplifier

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Factory Amp to Aftermarket amplifier via high level

High level loopback harness

High level loopback harness

from Factory amplifier to & from Aftermarket 4ch amp

Factory Radio to Multi aftermarket amps

Low Level loopback harness

Low Level loopback harness

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The truth they wont admit

If can-bus was the future then companies like, PAC, METRA, Audison, Focal and others wouldn't be backstepping to using our speaker level harness designs (created in 2017 by us). A solution that could have been created in the 1990's. They would be pushing can-bus solutions like the amp pro (out in 2019 by PAC audio who now had to come out with the "pro-t-harness"(2022) a direct and stolen copy of our Base Connectors.

Customer experience

it took a while to get here but was worth the wait. Unbelievably no one locally could help bypass my ANC these guys custom make the harness you need.

Timothy M.

Ordered my a bose harness for my 23 cadilac after a shop wanted to charge me 400 for a pac unit.I reached out to support and they where great help 👍 got it with the linkdq and it sounds amazing. Thank you

Christopher h.

Works great, very very well made and professional looking when in stalled in the dash. Also very easy to install. Took a long while to receive and customer service was terrible. But the product itself is great

James C.

The quality of the product was perfect. Was an easy install and it worked just like it was supposed to. Great product highly recommend to anyone installing an amp in a vehicle. Would buy again for sure.

Nick C.

Installed aftermarket sub and amp and was left with a loud hum noise. Simple plug and play ANC bypass harness completely eliminated the noise, crystal clear bass and I didn’t have to hack up the factory wiring

Mike T.