Yamaha - Adapter Header Electrical Connector 90890-03176-00. Overview. This is one of those adapters you end up needing when tying different Yamaha components together during a clean rig. It keeps your connections straightforward without having to splice or improvise, which is always the better route on the water. I've used these when adding or troubleshooting electronics, and having the right adapter saves a lot of time and frustration. It's simple, but it keeps your system working the way Yamaha intended.. Key Features. Factory-Style Connection - Matches Yamaha connectors for a secure and proper fit.. Consistent Electrical Flow - Helps maintain stable communication between connected components.. No Wire Cutting Needed - Designed for plug-and-play installation without modifying harnesses.. Marine-Ready Build - Handles vibration, humidity, and everyday boating conditions.. Engine & Boat Compatibility. Works with a variety of Yamaha outboard systems and marine electronics that rely on f