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ABOUT THE AUX3  

With the wide variety of audio sources available today (MP3, Satellite radio, DVD, Play station, Xbox, etc.) 
you should not have to chose just one to input to your mobile audio system. The Soundgate AUX3 is a full 
bandwidth, high-performance audio switching device which allows you to easily select between 3 separate 
audio sources. As an example, you can input the audio from an MP3 Player (iPod etc), DVD player, and 
Satellite Radio (XM or Sirius) to your audio system, and select between them with a simply flip of a switch.

  

 

1.

 

INSTALLATION 
 

1.

 

Turn the ignition key to “Off” 

2.

 

Make sure the audio system components are turned to the “Off” position 

3.

 

The installation location for the AUX3 will vary from vehicle to vehicle. Please consult a factory 
service manual for exact disassembly instructions if you are unsure of the procedure. Pay close 
attention to any warning instructions regarding working in or around airbags. 

Install the AUX3 

4.

 

Choose a convenient location to mount the AUX3 

5.

 

Route the switch harness to the switch mounting location and mount the selector switch. 
Approximately 18” from the switch is a small white connector which can be disconnected to allow 
easier routing and installation of the switch and associated wiring. Make sure and reconnect this 
connector after installation. 

6.

 

Connect the black wire with the ring terminal to a good bare metal chassis ground. DO NOT use 
the ground in the factory wiring harness. 

7.

 

Install a fuse holder with a 1AMP fuse in the red wire and connect to a +12Volt switched source. 
DO NOT use the switched 12 Volt in the factory wiring harness 

Install the auxiliary components per the manufacturer’s instructions 

8.

 

Choose a convenient location to mount the auxiliary component (s). Following the instruction 
supplied with the component (s), complete the installation. 

9.

 

Run the audio cables from the new component(s) to the Soundgate AUX3 

10.

 

Connect the RCA cables from the new component(s) to the AUX3. We recommend connecting 
the component you will listen to more often to the RCA’s on the white connector labeled “

MAIN 

INPUT”

. When the selector switch is in the center position, the relays are not energized, and the 

“MAIN INPUT”

 is active. Connect up to two more components to the RCA’s on the opposite end 

of the AUX3 labeled 

“INPUT A”

 and 

“INPUT B”.

 See our exclusive diagram below. 

 

 

 

 

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