38552-ZY0-020AH Harness Kit (8D-20D) - Overview. The 38552-ZY0-020AH Harness Kit (8D-20D) is a vital component in Honda marine engine systems, designed specifically for the electrical rigging of Honda outboards ranging from 8D to 20D horsepower models. This harness kit supports the key switch panel system providing reliable connections for the ignition switch, emergency stop switch, alert lights, and associated components essential for smooth engine operation. Engineered to OEM specifications, i