{"product_id":"mercury-harn-ext-outer-40-84-8m0159756","title":"Mercury – Outer Helm Extension Harness | 40-Foot Extension | 84-8M0159756","description":"\u003cp data-start=\"0\" data-end=\"77\"\u003e\u003cstrong data-start=\"0\" data-end=\"77\"\u003eMercury – Outer Helm Extension Harness | 40-Foot Extension | 84-8M0159756\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"79\" data-end=\"82\"\u003e\n\u003cp data-start=\"84\" data-end=\"563\"\u003e\u003cstrong data-start=\"84\" data-end=\"96\"\u003eOverview\u003c\/strong\u003e\u003cbr data-start=\"96\" data-end=\"99\"\u003eThis 40-foot extension harness is built for wide transoms and long rigging runs on triple- and quad-engine boats. When the outer engines sit way outboard and the factory harness just won’t reach comfortably, this piece gives you the distance you need without stretching or forcing the wiring. It lets the harness follow a smoother path so everything feels calmer at the helm. On big offshore rigs, that extra room makes rigging and service work a whole lot easier.\u003c\/p\u003e\n\u003chr data-start=\"565\" data-end=\"568\"\u003e\n\u003cp data-start=\"570\" data-end=\"1111\"\u003e\u003cstrong data-start=\"570\" data-end=\"586\"\u003eKey Features\u003c\/strong\u003e\u003cbr data-start=\"586\" data-end=\"589\"\u003e    • \u003cstrong data-start=\"615\" data-end=\"636\"\u003e40-Foot Extension\u003c\/strong\u003e – Long reach for the largest hulls and wide-beam layouts.\u003cbr data-start=\"694\" data-end=\"697\"\u003e    • \u003cstrong data-start=\"723\" data-end=\"743\"\u003eOuter-Engine Use\u003c\/strong\u003e – Built for the outer engines in triple and quad DTS setups.\u003cbr data-start=\"804\" data-end=\"807\"\u003e    • \u003cstrong data-start=\"833\" data-end=\"851\"\u003eOEM Connectors\u003c\/strong\u003e – Factory ends that snap in solid and stay locked.\u003cbr data-start=\"902\" data-end=\"905\"\u003e    • \u003cstrong data-start=\"931\" data-end=\"951\"\u003eFlexible Routing\u003c\/strong\u003e – Helps avoid kinks, pinched runs, and stressed wiring.\u003cbr data-start=\"1007\" data-end=\"1010\"\u003e    • \u003cstrong data-start=\"1036\" data-end=\"1059\"\u003eSteady Control Path\u003c\/strong\u003e – Supports smooth throttle and shift communication.\u003c\/p\u003e\n\u003chr data-start=\"1113\" data-end=\"1116\"\u003e\n\u003cp data-start=\"1118\" data-end=\"1286\"\u003e\u003cstrong data-start=\"1118\" data-end=\"1149\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003cbr data-start=\"1149\" data-end=\"1152\"\u003e    • Triple engine\u003cbr data-start=\"1191\" data-end=\"1194\"\u003e    • Quad engine\u003cbr data-start=\"1231\" data-end=\"1234\"\u003e    • Outer-engine helm pathways\u003c\/p\u003e\n\u003chr data-start=\"1288\" data-end=\"1291\"\u003e\n\u003cp data-start=\"1293\" data-end=\"1734\"\u003e\u003cstrong data-start=\"1293\" data-end=\"1329\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003cbr data-start=\"1329\" data-end=\"1332\"\u003eWith this much length to work with, the harness can take a relaxed route instead of being shoved into tight corners. That keeps control inputs feeling smooth and predictable because the wiring isn’t under strain. It also leaves more room in the rigging bay, making inspections or service work far less frustrating. On big boats, this extension simply makes everything feel cleaner and easier to manage.\u003c\/p\u003e\n\u003chr data-start=\"1736\" data-end=\"1739\"\u003e\n\u003cp data-start=\"1741\" data-end=\"2009\"\u003e\u003cstrong data-start=\"1741\" data-end=\"1756\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003cbr data-start=\"1756\" data-end=\"1759\"\u003eOEM harnesses hold up to vibration, heat, and saltwater better than generic cables. The connectors fit exactly the way Mercury designed, so you’re not chasing odd glitches or loose plugs. It’s wiring made for real-world use and long-term reliability.\u003c\/p\u003e\n\u003chr data-start=\"2011\" data-end=\"2014\"\u003e\n\u003cp data-start=\"2016\" data-end=\"2199\"\u003e\u003cstrong data-start=\"2016\" data-end=\"2023\"\u003eFAQ\u003c\/strong\u003e\u003cbr data-start=\"2023\" data-end=\"2026\"\u003e\u003cstrong data-start=\"2026\" data-end=\"2075\"\u003eQ1: How do I know I need the 40-foot version?\u003c\/strong\u003e\u003cbr data-start=\"2075\" data-end=\"2078\"\u003eA: If your outer engines sit far outboard and the standard harness won’t reach cleanly, this is the length that fixes it.\u003c\/p\u003e\n\u003cp data-start=\"2201\" data-end=\"2274\"\u003e\u003cstrong data-start=\"2201\" data-end=\"2236\"\u003eQ2: Any special setup required?\u003c\/strong\u003e\u003cbr data-start=\"2236\" data-end=\"2239\"\u003eA: No—just plug it in and route it.\u003c\/p\u003e\n\u003cp data-start=\"2276\" data-end=\"2392\"\u003e\u003cstrong data-start=\"2276\" data-end=\"2317\"\u003eQ3: How does it hold up in saltwater?\u003c\/strong\u003e\u003cbr data-start=\"2317\" data-end=\"2320\"\u003eA: Very well. A quick rinse now and then keeps everything in good shape.\u003c\/p\u003e\n\u003cp data-start=\"2394\" data-end=\"2510\"\u003e\u003cstrong data-start=\"2394\" data-end=\"2426\"\u003eQ4: Any installation advice?\u003c\/strong\u003e\u003cbr data-start=\"2426\" data-end=\"2429\"\u003eA: Keep the path smooth with wide curves and avoid rubbing points along the hull.\u003c\/p\u003e\n\u003cp data-start=\"2512\" data-end=\"2631\"\u003e\u003cstrong data-start=\"2512\" data-end=\"2566\"\u003eQ5: What are signs the harness may be wearing out?\u003c\/strong\u003e\u003cbr data-start=\"2566\" data-end=\"2569\"\u003eA: Hesitant controls, signal dropouts, or visible jacket wear.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935986602275,"sku":"84-8M0159756","price":404.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV781351.jpg?v=1720534679","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-harn-ext-outer-40-84-8m0159756","provider":"PartsVu","version":"1.0","type":"link"}