Hogtunes NCA 450-RM : 4 Channel Amplifier / 4x50 watts (2014 - model year) - Manual (Page 5)

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Step #5: Sit the supplied silver plate
on top of the radio as
shown in Fig 1.2. Locate
and install one of the
supplied “star” washers
on each factory screw and
re-install the screw/washer
through the silver plate,
through the factory black
plate and into the top of the
radio. Locate the main
power harness and plug it
into the matching “pig-tail”
on the side of the amp.
There are two options
for the way the amp
will be used. Please
identify which one
you will use before
proceeding.
OPTION 1:
If amp is being used to power front and rear speakers in
stock locations on an Ultra Classic:

•Therearwireharnessyouneedisthelongestinyourkit.Locate
this harness and plug the one end into the mating 8 pin pigtail
coming out of the amp. On the side of the amp, you will see
a switch labeled “fader/no fader” Make sure this switch is on
“fader”.
OPTION 2:
If this amp will have the rear channels powering
speaker lids, fairing lower speakers or rears speakers on a
Street Glide or other “non Ultra” model:
  •Inthekityouwillseean8pin“rearaccessoryharness”with
four short brown/black and blue/black wires. Install this into
the mating plug on the side of the amp. You will need to run
the wires for your second set of speakers and splice into this
harness. Please do a good job….. Our wires are labeled
for ease.
Figure 1.2 - Amplifier and mounting plate
correctly oriented. The plate with four small
holes is for mounting a popular Harley
accessory. The white circles show tabs which
are there for the “Christmas Tree” fasteners
to re-secure the harnesses lifted earlier.