{"product_id":"mercury-harnes-1helm-40ft-84-8m0048058","title":"Mercury – Malfunction Light Harness | 40-Foot Single-Helm Cable | 84-8M0048058","description":"\u003cp data-start=\"0\" data-end=\"82\"\u003e\u003cstrong data-start=\"0\" data-end=\"82\"\u003eMercury – Malfunction Light Harness | 40-Foot Single-Helm Cable | 84-8M0048058\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"84\" data-end=\"87\"\u003e\n\u003cp data-start=\"89\" data-end=\"101\"\u003e\u003cstrong data-start=\"89\" data-end=\"101\"\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"103\" data-end=\"594\"\u003eLarge boats with long console runs or deep rigging channels often need more reach than a standard harness can offer. The Mercury 84-8M0048058 Malfunction Light Harness provides a full \u003cstrong data-start=\"287\" data-end=\"298\"\u003e40 feet\u003c\/strong\u003e of length, giving you plenty of room to route the catalyst-warning signal from the engine compartment all the way to the helm. Once in place, it ensures the dash-mounted malfunction light responds immediately whenever the catalyst system detects an issue—just like a check-engine light on a car.\u003c\/p\u003e\n\u003chr data-start=\"596\" data-end=\"599\"\u003e\n\u003cp data-start=\"601\" data-end=\"617\"\u003e\u003cstrong data-start=\"601\" data-end=\"617\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"621\" data-end=\"715\"\u003e\n\u003cstrong data-start=\"621\" data-end=\"642\"\u003e40-Foot Harness –\u003c\/strong\u003e Longest single-helm option for large boats and extended rigging paths.\u003c\/li\u003e\n\u003cli data-start=\"718\" data-end=\"822\"\u003e\n\u003cstrong data-start=\"718\" data-end=\"743\"\u003eOBDM Alert Delivery –\u003c\/strong\u003e Sends catalyst-system warnings straight to the dash-mounted indicator light.\u003c\/li\u003e\n\u003cli data-start=\"825\" data-end=\"919\"\u003e\n\u003cstrong data-start=\"825\" data-end=\"850\"\u003eCatalyst-Compatible –\u003c\/strong\u003e Works on \u003cem data-start=\"860\" data-end=\"865\"\u003eall\u003c\/em\u003e MerCruiser engines equipped with a catalyst system.\u003c\/li\u003e\n\u003cli data-start=\"922\" data-end=\"1018\"\u003e\n\u003cstrong data-start=\"922\" data-end=\"950\"\u003eOEM Mercury Connectors –\u003c\/strong\u003e Factory-fit ends ensure proper alignment and a secure connection.\u003c\/li\u003e\n\u003cli data-start=\"1021\" data-end=\"1119\"\u003e\n\u003cstrong data-start=\"1021\" data-end=\"1050\"\u003eFlexible Routing Length –\u003c\/strong\u003e Ideal for extended cabins, deep-V hulls, and complex helm layouts.\u003c\/li\u003e\n\u003cli data-start=\"1122\" data-end=\"1244\"\u003e\n\u003cstrong data-start=\"1122\" data-end=\"1155\"\u003eReliable Fault Notification –\u003c\/strong\u003e Ensures your dash light triggers the moment the system detects a catalyst malfunction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1246\" data-end=\"1249\"\u003e\n\u003cp data-start=\"1251\" data-end=\"1268\"\u003e\u003cstrong data-start=\"1251\" data-end=\"1268\"\u003eCompatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1272\" data-end=\"1318\"\u003eAll \u003cstrong data-start=\"1276\" data-end=\"1316\"\u003ecatalyst-equipped MerCruiser engines\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1321\" data-end=\"1374\"\u003eDash-Mounted Catalyst Malfunction Light (8M0046481)\u003c\/li\u003e\n\u003cli data-start=\"1377\" data-end=\"1432\"\u003eSingle-helm installations requiring a 40-foot harness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1434\" data-end=\"1437\"\u003e\n\u003cp data-start=\"1439\" data-end=\"1475\"\u003e\u003cstrong data-start=\"1439\" data-end=\"1475\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1477\" data-end=\"1935\"\u003eThis long harness gives you the freedom to route the malfunction-light circuit cleanly through bulkheads, under decking, and along long rigging corridors. Once connected, the catalyst light provides an immediate visual cue when the emissions system needs attention, helping you address issues early and avoid more serious problems down the road. On larger boats where access can be tight, this extra cable length keeps the installation clean and stress-free.\u003c\/p\u003e\n\u003chr data-start=\"1937\" data-end=\"1940\"\u003e\n\u003cp data-start=\"1942\" data-end=\"1957\"\u003e\u003cstrong data-start=\"1942\" data-end=\"1957\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1959\" data-end=\"2355\"\u003eCatalyst alerts are too important to trust to generic wiring. Mercury’s OEM harness is built with proper shielding, correct pinout, and marine-grade connectors designed to stand up to vibration, moisture, and engine-room heat. Aftermarket harnesses can cause false alarms or—worse—fail to trigger the light at all. The factory version ensures dependable communication every time you turn the key.\u003c\/p\u003e\n\u003chr data-start=\"2357\" data-end=\"2360\"\u003e\n\u003cp data-start=\"2362\" data-end=\"2369\"\u003e\u003cstrong data-start=\"2362\" data-end=\"2369\"\u003eFAQ\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2371\" data-end=\"2501\"\u003e\u003cstrong data-start=\"2371\" data-end=\"2410\"\u003eQ1: What does this harness connect?\u003c\/strong\u003e\u003cbr data-start=\"2410\" data-end=\"2413\"\u003eIt links the engine’s OBDM catalyst-alert circuit to the dash-mounted malfunction light.\u003c\/p\u003e\n\u003cp data-start=\"2503\" data-end=\"2637\"\u003e\u003cstrong data-start=\"2503\" data-end=\"2542\"\u003eQ2: Why choose the 40-foot version?\u003c\/strong\u003e\u003cbr data-start=\"2542\" data-end=\"2545\"\u003eIt’s ideal for large boats or long helm layouts where shorter harnesses can’t reach cleanly.\u003c\/p\u003e\n\u003cp data-start=\"2639\" data-end=\"2761\"\u003e\u003cstrong data-start=\"2639\" data-end=\"2688\"\u003eQ3: Will this work on all MerCruiser engines?\u003c\/strong\u003e\u003cbr data-start=\"2688\" data-end=\"2691\"\u003eIt works on \u003cstrong data-start=\"2703\" data-end=\"2760\"\u003eany MerCruiser engine equipped with a catalyst system\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2763\" data-end=\"2876\"\u003e\u003cstrong data-start=\"2763\" data-end=\"2811\"\u003eQ4: Does this include the malfunction light?\u003c\/strong\u003e\u003cbr data-start=\"2811\" data-end=\"2814\"\u003eNo. The light is sold separately as part number \u003cstrong data-start=\"2862\" data-end=\"2875\"\u003e8M0046481\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2878\" data-end=\"3016\"\u003e\u003cstrong data-start=\"2878\" data-end=\"2912\"\u003eQ5: Is installation difficult?\u003c\/strong\u003e\u003cbr data-start=\"2912\" data-end=\"2915\"\u003eNo. It uses OEM connectors and routes like any standard helm harness—just with more length to manage.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46936019534115,"sku":"84-8M0048058","price":29.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV703521.jpg?v=1698795794","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-harnes-1helm-40ft-84-8m0048058","provider":"PartsVu","version":"1.0","type":"link"}