Mercury - Zero Effort Trim Adapter Harness 8-Pin to Bullet Trim Link 84-8M0109408. OverviewThis harness lets a newer Zero Effort control-with the 8-pin Trim All connector-tie into a trim setup that still uses bullet-style ends. It's basically the "bridge" between generations, so you don't have to splice wires or make up your own adapter. If you're updating controls or sorting out a repower and the connectors don't match, this piece keeps the trim circuit clean and working the way it should.. Key