Our 2019-2022 GM/GMC A/T Elite Harness has been tested, redesigned and modified to what it is now by our team at LLJ Customs. The “Elite Series” harness has been years worth of time and effort to provide our customers with a product that will last a lifetime. This option is an all-in-on solution for the ultimate DIY’er. After years of developing our own wire and combining LOC’s, processors, DSP’s and companies like Audio Control and Rockford Fosgate, who offer amplifiers with a high level input signal. By combining these top shelf solutions for the 12V market you can get an entire system upgrade at the same price of a factory head unit upgrade alone.
The Elite T-Harness allows you to add an aftermarket mono amp/subwoofers while retaining all the features in your vehicle like the Bluetooth, Steering Wheel Controls and OnStar. This harness was designed for the Non-Bose, Non-Factory Amplified system. You are able to build and customize your harness to your preferences and needs; like the length of the harness or adding an LOC unit of your choice. We offer a variety of choices like an Audio Control LC2i Pro, a Link2 or LinkDQ from Wavtech for when you are just adding a subwoofer/s. With an LOC added to the harness you are getting a full plug and play set up; with the harness providing signal and the LOC unit providing RCA out and remote turn on to your amp.
By offering our customers the option to customize their harness we also offer the option to use your own LOC unit, you are not limited to using the units we offer. Every harness ordered without an LOC unit will come with a color card to help you wire your own equipment. The harness (with no unit) will come as a 4 channel, allowing you to use either a 2 channel, 4 channel or 6 channel DSP or processor.
This T-harness is not only for a mono amp/subwoofer install, you are also able to use this harness if you are planning on replacing your door speakers or installing full system and are planning on running your own wire back to the speakers. It can be purchased with a processor like an Audio Control LC7i or a Link6 from Wavtech, these are 6 channel processors. You also have the option of using a DSP like a DSR1 from Rockford Fosgate or a DM-608 from Audio Control.
For a simple, quick and clean full system set up, without the need to run your own wire we offer our Elite Loopback Harness. LLJ Customs is the creator of the OEM Loopback Harness. When the company first began what is now known as the T-Harness and Loop Harness were not a definitive plug and play option available. What was typically found was wiring that needed modifications to the physical harness and add on’s that were not offered. Frustrated with the lack of options available, the extensive research needed and lack of help from audio shops we created something that would help others add new speakers, new amplifiers, new subwoofers and keep everything looking and functioning as factory.
The Loopback Harness comes with 2 ends, a signal side and a return side. The signal side will feed into a 4+ channel amp that takes a high level or a processor and returns (or loops back) that amplified signal directly from the output on the amp, to the speaker locations using the factory wiring. This is ideal if you are simply adding an amp to speakers or if you want to add multiple amps and go all out with a complete new system. Our harness grants you the access of your already available and paid for factory wiring.
The Loop Harness provides all of this in one consolidated product. It provides the signal, the return and it also provides power up to 10amps for most processor and DSP’s. This means you are only running 2 things, the Loop Harness from the source and the power wire from your battery. In some cars this is especially beneficial as sometimes they have the signal source (radio or factory amplifier) in the trunk along with the battery.
Every unit ordered with the harness will come pre-wired and is tested before leaving our facility. Every product purchased from us comes with a 5 year warranty, including any processors, amps or DSP’s.
*For the Non-Bose, Non-Factory Amplified system the connectors will be located behind the glove box, above the kick panel. This harness is for the Aqua and Tan connectors, please verify this is the connect you have. They are not interchangeable; ordering the wrong color may cause delays in your install by needing to exchange the harness.
*Harness includes remote turn on wire when purchased with an LOC/Processor only.
*This item has an $25 restocking fee, please verify the connector color is correct before placing your order*
Looking to add a sub? Keep the install simple with your 2019-2022 T-Harness:
The 2019-2022 T-Harness will plug in behind the glove box, above the kick panel.
- The connectors can be either Aqua and Tan or Black and Gray, remember to verify before placing an order.
- In small SUVs or Pick-Ups the connectors may be behind the screen (select 2018-2022 models)
The LOC that was ordered with your harness, or your own you attached, will provide RCA out and Remote turn on.
- Run your RCA wires from the output on the LOC to the RCA input on your mono amp.
- Run your remote turn on wire (blue wire) from the LOC unit to the mono amp.
Lastly run your power wire to your amp from the battery and a ground wire within 18 inches or shorter.
- The chimes are not affected in any way when adding subs.
All done! You’ve added a sub, congratulations!
**T-Harnesses currently have a 1 week lead time.Loopback Harness currently have a 15 business day lead time. **