Do you have a question about the Hogtunes NCA 450-RM and is the answer not in the manual?
Disconnect positive and negative battery terminals before proceeding with installation.
Connect rear harness for stock Ultra Classic front and rear speaker setup.
Connect rear accessory harness for speaker lids or fairing lower speakers.
Attach amp's red wire to positive and black wire to negative battery terminals.
Turn on stereo, test all speakers, and check fader control.
Turn front wheel to extremes to ensure wiring does not impede steering.