Hogtunes NCA 450U KIT-AA : 4 Channel Amp / Speakers (1998 - 2013 - model years) - Manual (Page 3)

Step #6: Locate the “Fader/No Fader” switch on the side of the amplifier, and
make sure it is in the “Fader” position. In this position, the amplifiers
front and rear channels are controlled independently by the Ultra radios
built in fader. If the switch is in the “No Fader” position, all
4 channels are driven equally and although all 4 channels
will play, the radio’s fader will not work.
Step #7: Locate the 3 position switch on the side of the amplifier marked
“GAIN” and make sure this switch is in the “+3” position. Since Ultra
radios come with a fader, you can use the fader control to adjust front/
rear balance. If you were to run this amp off a 2 channel radio (no
fader) the switch would go to the “No Fader” position and the gain
switch would be used to adjust the volume of whatever is plugged into
the rear channels.
Step #8: The power harness ends in a black plug with 1 larger (10awg) red
wire, 1 larger (10awg) black wire and 1 smaller orange wire. Locate
this and plug it into the matching black “pigtail” on the amplifier. The
input harness has a smaller black 8 pin plug with smaller gauge wire.
Plug this into the black “pigtail” socket on the amplifier marked “hi level
input”. Locate the 4 pin black plug with black/brown and black/blue
wires. This will plug into the “front out” on the amp, which is a “pigtail”
ending with a 4 pin black socket.
note: there is a pigtail ending with a blue socket labeled
“bypass out”. this carries the radios built in power (front
channels only) and although not used in this kit, it is there
for plug and play future system expansion.
The amplifier mounts inside the fairing “over” the radio using the side
plates shown below. The side plates are attached to the side of the
amplifier by removing 4 screws on each side of the amp, positioning the
plates as shown below and re-installing the screws into the amp. Factory
CB, XM, and other similar modules are mounted on top of the radio and
secured with a screw that goes into the back of the radio. Remove the
screw and let the module(s) hang for now. Do not install the
module shelf yet! Each side of the radio has 2 large allen head
bolts that secure the radio into the fairing. You will loosen the bolts on
each side that are farthest away from you (closest to the inner fairing)
and remove the bolts closest to you. The amp will “clip in” to the back
bolts and the bolts removed will go back in over the plates to secure the
amp. Re-tighten all 4 bolts to factory specs. Install the module shelf as
shown, noting that the “stove bolt” heads must be positioned as shown.
Your module(s) will screw into the shelf using the factory screw(s) you
removed from the back of the radio.
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