Mercury - Power Trim Adapter Harness 84-898286T01. The Mercury Power Trim Adapter Harness is designed to bridge trim wiring connections between older Mercury outboards and newer control or trim interfaces. It provides a clean, factory-style solution when connector styles do not match, allowing trim systems to function correctly without cutting, splicing, or modifying original wiring. This makes it especially useful during repowers, control upgrades, or trim system updates.. Maintaining proper el