Mercury – Auxiliary Dash Switch Harness (Duals) | Trim Switch Interface | 84-866704T01Mercury Auxiliary Dash Switch Harness (Duals) Trim Switch Interface 84 866704T01 OverviewThis harness gives dual engine DTS boats a clean way to add an auxiliary trim switch at the dash. It plugs in between the 8 pin trim connector and the command module harness, so theres no splicing or guesswork. The setup is straightforwardjust plug it in and your extra trim control is ready to use. Its a simple add on that keeps the wiring tidy and makes trim
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