Mercury - Boat Harness Adapter 6-Pin Female-to-Female, 6-Foot 84-883459T01. Overview. When repowering or updating rigging, it's common to end up with a new engine that uses a female 6-pin connector while the boat still has a female 6-pin harness. The Mercury 84-883459T01 Boat Harness Adapter fixes that mismatch. With female connectors on both ends and six feet of length, it gives you the reach and the correct gender pairing needed to connect the engine and boat harness without cutting, splicing,