Our harness throughout the years has evolved into what we call, and are currently in the process of patenting, our Elite Series Harness. This option is an all-in-on solution for the ultimate DIY’er.. After 3 years, 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.
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 Elite 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 Elite Loopback 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.
Our Elite T-Harness was designed and tested with the goal of making your install quick, clean and simple. This T-Harness will allow you to install a mono amp/subs with the option of using an LOC like an Audio Control LC2i Pro, a Link2 or LinkDQ from Wavtech. This creates a full Plug and Play set up with the harness providing signal and the LOC providing RCA out and remote turn on for your amp. Our harnesses have a built in fuse to protect your head unit.
Don’t have an mono amp yet? No problem, we offer amplifiers with built in LOC’s. These amps can be wired directly to the harness without the need of an additional unit. Less wiring, less hassle.
Our harness is available on its own as well; what does that mean? It means you are able to use the equipment you prefer, you are not limited to using the units we offer. Our Bose T-Harness can be made as a 6 channel (provides tweeters, fronts and rears) to be used with a 6 channel LOC or DSP or as a 2 channel to be used with a 2 channel LOC. The 6 channel option is great for those who are planning on installing a full system and want to run their own wire to the speaker locations. For example: Rockford Fosgate offers a Power Single 12” or 10” T1 Slim Sealed Loaded Enclosure which can be wired directly into a 2 channel Bose T-Harness.
When choosing an LOC it is important to know if one is even needed. Especially if you already have your own equipment. Look at what the parameters of that equipment are and if the amp takes a high level. For example some mono-amp’s cant take above 5V of signal input. When using a Wavtech Link2 or an Audio Control LC2i Pro you want to verify the signal output does not exceed what the amp can take.
It is recommended to verify if the vehicle has Active Noise Cancelation (ANC) before placing an order. You can do so by checking for the microphones in the headliner, above the rear seat. With aftermarket subs or speakers the ANC microphones create a feedback. To avoid the humming or “pop-like” sound from happening we offer our Bose ANC Bypass. This plugs into the Bose amp as the diagram in the pictures will show.
This unit will work with all GM vehicles Equipped with a BOSE OEM amplified system from 2019-2024. Including:
150% Plug and Play
Some Bose amps have aGRAYconnector instead of aBLACKconnector. This harness will still work with your gray connector. It will have an offset tab, we will cut one of the tabs on our harness to fit your vehicle. If your harness has both side tabs please note theLEFTtab needs to betrimmed.
Harness ordered with an LOC/Processor includes a remote turn on cable.
Looking to add a sub? Keep the install simple with your Bose T-Harness:
The Bose T-Harness will plug in at the Bose amp
- In a truck at may be behind the rear seat
- In a car/sedan it may be under the center console next to the gas pedal or in the trunk.
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.
**T-Harnesses currently have a 1 week lead time.Loopback Harness currently have a 15 business day lead time. **