SO EASY! I'm very glad I found this. Installed a Kicker Key 500.1 & Kicker Sub in the factory locations in a 2026 Bronco with the B&O sound system. Unplug factory amp, plug in this harness to both the factory amp and the pigtail to the Kicker Key. Power to the battery, ground to the factory ground point above the enclosure, speaker wire to the sub... run through the setup. Bronco finally sounds like it should.