Hogtunes NCA 450U Kit-RM : 4 Channel Amplifier / Speakers (2014 - model year) - Manual (Page 9)

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Step #3: Next to the “fader/no fader” switch is a 3 position switch to adjust the
rear channel volume. On Ultra Classics, we use the bike’s built in fader
control to allow you to adjust the front/rear volume from the radio itself.
For best performance, this switch needs to be left in the +3 position.
Step #4: Attach the amp’s red wire to the positive (+) battery terminal and the
amp’s black wire to the negative (-) battery terminal. The factory battery
wires are also re-installed at this point. When attaching the power and
ground wires, it is always a good practice to do the negative first.
When the positive connector touches the battery, some sparking is
normal. This is a function of the capacitors in the amplifier charging up.
Step #5: Turn the stereo on and, at low volume, test to make sure all four
speakers are working. Make sure the radio’s fader control is adjusting
the volume between front and rear speakers. If not, double check the
“Fader/No Fader” switch.
Step #6: Re-install the seat making sure the amplifier’s “+” and “-” connectors are
positioned in such a way so they will not bend or break when the rider’s
weight is on the seat.
This is the best time to take a few minutes to “clean up” the wiring
and secure using supplied zip-ties.
Before re-installing outer fairing, turn front wheel
to each extreme side making sure any wiring is
not impeding the steering of the motorcycle.
Failure to do so can result in serious
injury or death!
Re-install the fairing and your system is now ready to enjoy!