Mazda 6 Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
157 Posts
Discussion Starter #1
Finally solved the mystery connector on the 2018+ TAU connector. This guide will show how to add a amp to a 2018+ Non-Bose and pass the amplified signal back to stock wiring. Going from TAU > Harness > Amp > Stock Harness. Absolutely no cutting of the stock wires and fully reversible. New wires can be ran if needed. Could possibly be used for Bose systems but I don't have it to test.

Parts used:

SCOSCHE NN04RB Reverse Stereo Harness
SCOSCHE NN04B Stereo Harness
Scosche SLC4 Line Output Converter
Alpine KTP-445U 4-channel Power Pack Amplifier

1. Since the harness has more connections than needed and missing in 1 slot. We have to remove and rearrange some of the pins. Used a bobby pin that had been dremel down in both width and height.

How to remove wires. Just push into the flat slot and pull the wire out the back.



Removed the Orange, Orange/White and Blue wire from the new harnesses. Added the blue wire back to the slot under the red wire.

How both harnesses should look afterwards.



2. Connect up the speaker wires from the SCOSCHE NN04RB Reverse Stereo Harness to the Scosche SLC4 Line Output Converter like so and switch to "Line Out". Wire up the speaker wires from the SCOSCHE NN04B Stereo Harness to the output wires of the Amp. Wire up the rest of the Power, ACC, Ground and Speed sensor wires back to the 2 stereo harnesses. Added a wire to the Red ACC wire for amp turn on. Had to use the extra Ground on the SLC-4 since I was getting some noise. Ran a new power wire from the interior fuse box.



3. Adjusting the Line out gain to half way was enough. Remove the glove box and you have access to the TAU. Used double sided tape to stick the Line out converter to the TAU.



4. Adjust the gain on the amp and stuck the amp into the glove box. Will tidy up the rats nest when I get some shorter RCA wires.
 

·
Registered
Joined
·
157 Posts
Discussion Starter #3
Why did you use an LOC? Did you measure the voltage coming from the wiring?
Just what I had on hand and I plan to use the unamped side on the other end to run some 3.5" speakers to the dash. I did not test the voltage at the wiring but speaker wire colors are above if anyone wants to test.
 

·
Registered
Joined
·
157 Posts
Discussion Starter #5
Sigh... you need to measure the voltage coming from what you think is the amplified side before using an LOC or you may reduce the signal too far.
Thanks for the suggestion. Measured 3.2V coming out of the TAU. Removed the Line out converter and soldered on RCAs. 20% gain on the amp will get my Infinity speakers super loud now. Will update the thread later since it would not allow it for 10 days.

239488
 

·
Registered
Joined
·
157 Posts
Discussion Starter #7
Does that tee harness plug into the Bose plugs or TAU plugs? I wouldnt mind using a plug to plug connection when i do mine. And that 3.2V will pair nicely with my Kicker ZR and ZX amps :)
Straight into the TAU if you have the newer 20 pin style connector on the top port. As long as you get the regular and the reverse stereo plugs and repin that one missing pin.
 
1 - 7 of 7 Posts
Top