32570-ZW9-000AH Mt Bf8D/9.9D Ext Hrn - Overview. The 32570-ZW9-000AH Mt Bf8D/9.9D Ext Hrn is a genuine Honda marine engine wiring harness extension specifically crafted for the BF8D and 9.9D series outboard engines. This essential component supports the electrical system by extending the main wiring harness, facilitating crucial electrical connections in manual tilt models. Designed to maintain seamless integration with existing parts, it helps ensure optimal performance and durability of your m