{"product_id":"mercury-harn-ext-inner-25-84-8m0159760","title":"Mercury – Inner Helm Extension Harness | 25-Foot Extension | 84-8M0159760","description":"\u003cp data-start=\"0\" data-end=\"77\"\u003e\u003cstrong data-start=\"0\" data-end=\"77\"\u003eMercury – Inner Helm Extension Harness | 25-Foot Extension | 84-8M0159760\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"79\" data-end=\"82\"\u003e\n\u003cp data-start=\"84\" data-end=\"596\"\u003e\u003cstrong data-start=\"84\" data-end=\"96\"\u003eOverview\u003c\/strong\u003e\u003cbr data-start=\"96\" data-end=\"99\"\u003eThis 25-foot inner-engine extension harness gives you the extra room needed to reach the inside engines on triple- and quad-engine boats. When the standard harness comes up short—or the rigging path winds through bulkheads or tight corners—this extension keeps things from getting stretched or pinched. It lets the wiring settle into a smoother route, which helps the controls feel more natural. On larger multi-engine rigs, that extra slack makes rigging and later service a lot less aggravating.\u003c\/p\u003e\n\u003chr data-start=\"598\" data-end=\"601\"\u003e\n\u003cp data-start=\"603\" data-end=\"1131\"\u003e\u003cstrong data-start=\"603\" data-end=\"619\"\u003eKey Features\u003c\/strong\u003e\u003cbr data-start=\"619\" data-end=\"622\"\u003e    • \u003cstrong data-start=\"648\" data-end=\"669\"\u003e25-Foot Extension\u003c\/strong\u003e – Adds solid extra reach for longer inner-engine runs.\u003cbr data-start=\"724\" data-end=\"727\"\u003e    • \u003cstrong data-start=\"753\" data-end=\"773\"\u003eInner-Engine Use\u003c\/strong\u003e – Made for the inside engines on triple and quad DTS setups.\u003cbr data-start=\"834\" data-end=\"837\"\u003e    • \u003cstrong data-start=\"863\" data-end=\"881\"\u003eOEM Connectors\u003c\/strong\u003e – Factory ends that seat firmly and stay locked.\u003cbr data-start=\"930\" data-end=\"933\"\u003e    • \u003cstrong data-start=\"959\" data-end=\"977\"\u003eSmooth Routing\u003c\/strong\u003e – Helps avoid sharp bends and tight squeeze points.\u003cbr data-start=\"1029\" data-end=\"1032\"\u003e    • \u003cstrong data-start=\"1058\" data-end=\"1082\"\u003eReliable Signal Path\u003c\/strong\u003e – Keeps throttle and shift communication steady.\u003c\/p\u003e\n\u003chr data-start=\"1133\" data-end=\"1136\"\u003e\n\u003cp data-start=\"1138\" data-end=\"1306\"\u003e\u003cstrong data-start=\"1138\" data-end=\"1169\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003cbr data-start=\"1169\" data-end=\"1172\"\u003e    • Triple engine\u003cbr data-start=\"1211\" data-end=\"1214\"\u003e    • Quad engine\u003cbr data-start=\"1251\" data-end=\"1254\"\u003e    • Inner-engine helm pathways\u003c\/p\u003e\n\u003chr data-start=\"1308\" data-end=\"1311\"\u003e\n\u003cp data-start=\"1313\" data-end=\"1731\"\u003e\u003cstrong data-start=\"1313\" data-end=\"1349\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003cbr data-start=\"1349\" data-end=\"1352\"\u003eThe extra length helps the harness follow an easier path instead of being forced through cramped spots. You’ll usually feel smoother control response because the wiring isn’t kinked or under tension. It also opens up the rigging bay so service work isn’t such a tight squeeze. On wide-beam offshore boats, that extra space makes the whole setup feel cleaner and more predictable.\u003c\/p\u003e\n\u003chr data-start=\"1733\" data-end=\"1736\"\u003e\n\u003cp data-start=\"1738\" data-end=\"2006\"\u003e\u003cstrong data-start=\"1738\" data-end=\"1753\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003cbr data-start=\"1753\" data-end=\"1756\"\u003eOEM wiring handles vibration, heat, and saltwater better than generic cable. The connectors are the exact match for Mercury’s system, which helps prevent loose plugs, glitches, and signal dropouts. It’s long-lasting rigging built for real marine use.\u003c\/p\u003e\n\u003chr data-start=\"2008\" data-end=\"2011\"\u003e\n\u003cp data-start=\"2013\" data-end=\"2202\"\u003e\u003cstrong data-start=\"2013\" data-end=\"2020\"\u003eFAQ\u003c\/strong\u003e\u003cbr data-start=\"2020\" data-end=\"2023\"\u003e\u003cstrong data-start=\"2023\" data-end=\"2072\"\u003eQ1: How do I know I need the 25-foot version?\u003c\/strong\u003e\u003cbr data-start=\"2072\" data-end=\"2075\"\u003eA: If your inner-engine run still feels tight with shorter extensions, this length usually gets you the clean routing you need.\u003c\/p\u003e\n\u003cp data-start=\"2204\" data-end=\"2269\"\u003e\u003cstrong data-start=\"2204\" data-end=\"2231\"\u003eQ2: Any setup required?\u003c\/strong\u003e\u003cbr data-start=\"2231\" data-end=\"2234\"\u003eA: No—just plug it in and route it.\u003c\/p\u003e\n\u003cp data-start=\"2271\" data-end=\"2389\"\u003e\u003cstrong data-start=\"2271\" data-end=\"2308\"\u003eQ3: Is it OK for saltwater boats?\u003c\/strong\u003e\u003cbr data-start=\"2308\" data-end=\"2311\"\u003eA: Yes. A quick rinse and connector check now and then keeps it in good shape.\u003c\/p\u003e\n\u003cp data-start=\"2391\" data-end=\"2491\"\u003e\u003cstrong data-start=\"2391\" data-end=\"2421\"\u003eQ4: Any installation tips?\u003c\/strong\u003e\u003cbr data-start=\"2421\" data-end=\"2424\"\u003eA: Use smooth, wide curves and avoid rubbing points along the hull.\u003c\/p\u003e\n\u003cp data-start=\"2493\" data-end=\"2635\"\u003e\u003cstrong data-start=\"2493\" data-end=\"2547\"\u003eQ5: What are signs the harness may be wearing out?\u003c\/strong\u003e\u003cbr data-start=\"2547\" data-end=\"2550\"\u003eA: Hesitant controls, intermittent signals, or visible jacket wear along tight spots.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935986274595,"sku":"84-8M0159760","price":187.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV781181.jpg?v=1720534667","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-harn-ext-inner-25-84-8m0159760","provider":"PartsVu","version":"1.0","type":"link"}