{"product_id":"mercury-harness-assy-84-866704t01","title":"Mercury – Auxiliary Dash Switch Harness (Duals) | Trim Switch Interface | 84-866704T01","description":"\u003cp data-start=\"0\" data-end=\"90\"\u003e\u003cstrong data-start=\"0\" data-end=\"90\"\u003eMercury – Auxiliary Dash Switch Harness (Duals) | Trim Switch Interface | 84-866704T01\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"92\" data-end=\"95\"\u003e\n\u003cp data-start=\"97\" data-end=\"501\"\u003e\u003cstrong data-start=\"97\" data-end=\"109\"\u003eOverview\u003c\/strong\u003e\u003cbr data-start=\"109\" data-end=\"112\"\u003eThis 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 there’s no splicing or guesswork. The setup is straightforward—just plug it in and your extra trim control is ready to use. It’s a simple add-on that keeps the wiring tidy and makes trim control easier to reach.\u003c\/p\u003e\n\u003chr data-start=\"503\" data-end=\"506\"\u003e\n\u003cp data-start=\"508\" data-end=\"1081\"\u003e\u003cstrong data-start=\"508\" data-end=\"524\"\u003eKey Features\u003c\/strong\u003e\u003cbr data-start=\"524\" data-end=\"527\"\u003e    • \u003cstrong data-start=\"553\" data-end=\"586\"\u003eAuxiliary Trim Switch Harness\u003c\/strong\u003e – Provides the wiring path for an added dash trim switch.\u003cbr data-start=\"644\" data-end=\"647\"\u003e    • \u003cstrong data-start=\"673\" data-end=\"696\"\u003eDual-Engine DTS Use\u003c\/strong\u003e – Built for two-engine Digital Throttle and Shift systems.\u003cbr data-start=\"755\" data-end=\"758\"\u003e    • \u003cstrong data-start=\"784\" data-end=\"804\"\u003eIn-Line Mounting\u003c\/strong\u003e – Installs between the 8-pin trim connector and the command module harness.\u003cbr data-start=\"880\" data-end=\"883\"\u003e    • \u003cstrong data-start=\"909\" data-end=\"930\"\u003eNo Diode Trim All\u003c\/strong\u003e – Direct trim-signal connection without “trim-all” logic.\u003cbr data-start=\"988\" data-end=\"991\"\u003e    • \u003cstrong data-start=\"1017\" data-end=\"1035\"\u003eOEM Connectors\u003c\/strong\u003e – Factory plugs that lock in and stay secure.\u003c\/p\u003e\n\u003chr data-start=\"1083\" data-end=\"1086\"\u003e\n\u003cp data-start=\"1088\" data-end=\"1279\"\u003e\u003cstrong data-start=\"1088\" data-end=\"1119\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003cbr data-start=\"1119\" data-end=\"1122\"\u003e    • Digital Throttle and Shift\u003cbr data-start=\"1174\" data-end=\"1177\"\u003e    • Dual engine\u003cbr data-start=\"1214\" data-end=\"1217\"\u003e    • Auxiliary dash-mounted trim switches\u003c\/p\u003e\n\u003chr data-start=\"1281\" data-end=\"1284\"\u003e\n\u003cp data-start=\"1286\" data-end=\"1649\"\u003e\u003cstrong data-start=\"1286\" data-end=\"1322\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003cbr data-start=\"1322\" data-end=\"1325\"\u003eHaving a second trim switch on the dash makes day-to-day running a bit easier, especially when you want quick access without reaching for the throttle handle. The harness keeps the wiring organized and avoids the messy look of improvised connections. Trim response stays steady since the signal follows a clean, direct path.\u003c\/p\u003e\n\u003chr data-start=\"1651\" data-end=\"1654\"\u003e\n\u003cp data-start=\"1656\" data-end=\"1883\"\u003e\u003cstrong data-start=\"1656\" data-end=\"1671\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003cbr data-start=\"1671\" data-end=\"1674\"\u003eOEM harnesses plug in exactly the way Mercury designed, so you avoid loose fits, odd trim behavior, or wiring headaches later. They hold up well to vibration, heat, and spray, giving you long-term reliability.\u003c\/p\u003e\n\u003chr data-start=\"1885\" data-end=\"1888\"\u003e\n\u003cp data-start=\"1890\" data-end=\"2067\"\u003e\u003cstrong data-start=\"1890\" data-end=\"1897\"\u003eFAQ\u003c\/strong\u003e\u003cbr data-start=\"1897\" data-end=\"1900\"\u003e\u003cstrong data-start=\"1900\" data-end=\"1942\"\u003eQ1: How do I know I need this harness?\u003c\/strong\u003e\u003cbr data-start=\"1942\" data-end=\"1945\"\u003eA: If you’re adding an auxiliary dash-mounted trim switch to a dual-engine DTS setup, this is the harness that ties it in.\u003c\/p\u003e\n\u003cp data-start=\"2069\" data-end=\"2165\"\u003e\u003cstrong data-start=\"2069\" data-end=\"2105\"\u003eQ2: Does it require calibration?\u003c\/strong\u003e\u003cbr data-start=\"2105\" data-end=\"2108\"\u003eA: No—just plug it in and the trim system works normally.\u003c\/p\u003e\n\u003cp data-start=\"2167\" data-end=\"2250\"\u003e\u003cstrong data-start=\"2167\" data-end=\"2190\"\u003eQ3: Saltwater safe?\u003c\/strong\u003e\u003cbr data-start=\"2190\" data-end=\"2193\"\u003eA: Yes. Rinse occasionally and keep the connectors clean.\u003c\/p\u003e\n\u003cp data-start=\"2252\" data-end=\"2379\"\u003e\u003cstrong data-start=\"2252\" data-end=\"2282\"\u003eQ4: Any installation tips?\u003c\/strong\u003e\u003cbr data-start=\"2282\" data-end=\"2285\"\u003eA: Mount it where the harness won’t rub on sharp edges, and leave a little slack for movement.\u003c\/p\u003e\n\u003cp data-start=\"2381\" data-end=\"2514\"\u003e\u003cstrong data-start=\"2381\" data-end=\"2428\"\u003eQ5: What are early signs of harness issues?\u003c\/strong\u003e\u003cbr data-start=\"2428\" data-end=\"2431\"\u003eA: Slow trim response, intermittent operation, or visible wear on the cable jacket.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46936046174499,"sku":"84-866704T01","price":120.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV645893.jpg?v=1698795927","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-harness-assy-84-866704t01","provider":"PartsVu","version":"1.0","type":"link"}