{"product_id":"mercury-harnes-1helm-30ft-84-8m0048057","title":"Mercury – Malfunction Light Harness | 30-Foot Single-Helm Cable | 84-8M0048057","description":"\u003cp data-start=\"0\" data-end=\"82\"\u003e\u003cstrong data-start=\"0\" data-end=\"82\"\u003eMercury – Malfunction Light Harness | 30-Foot Single-Helm Cable | 84-8M0048057\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=\"582\"\u003eCatalyst-equipped MerCruiser engines rely on a clear and dependable warning light to let you know when the emissions system needs attention. The Mercury 84-8M0048057 Malfunction Light Harness provides a full \u003cstrong data-start=\"311\" data-end=\"322\"\u003e30 feet\u003c\/strong\u003e of length—ideal for single-helm boats with long console runs, deep rigging paths, or layouts where shorter harnesses simply won’t reach. Once installed, it gives your dash-mounted catalyst light a clean, reliable connection to the engine’s OBDM alert circuit.\u003c\/p\u003e\n\u003chr data-start=\"584\" data-end=\"587\"\u003e\n\u003cp data-start=\"589\" data-end=\"605\"\u003e\u003cstrong data-start=\"589\" data-end=\"605\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"609\" data-end=\"701\"\u003e\n\u003cstrong data-start=\"609\" data-end=\"630\"\u003e30-Foot Harness –\u003c\/strong\u003e Longest single-helm option for extended console and rigging layouts.\u003c\/li\u003e\n\u003cli data-start=\"704\" data-end=\"802\"\u003e\n\u003cstrong data-start=\"704\" data-end=\"726\"\u003eOBDM Signal Path –\u003c\/strong\u003e Carries catalyst malfunction alerts directly to the dash indicator light.\u003c\/li\u003e\n\u003cli data-start=\"805\" data-end=\"908\"\u003e\n\u003cstrong data-start=\"805\" data-end=\"837\"\u003eCatalyst-Engine Compatible –\u003c\/strong\u003e Works with \u003cem data-start=\"849\" data-end=\"854\"\u003eall\u003c\/em\u003e MerCruiser engines equipped with a catalyst system.\u003c\/li\u003e\n\u003cli data-start=\"911\" data-end=\"1000\"\u003e\n\u003cstrong data-start=\"911\" data-end=\"931\"\u003eOEM Connectors –\u003c\/strong\u003e Factory Mercury ends ensure proper pin alignment and a secure fit.\u003c\/li\u003e\n\u003cli data-start=\"1003\" data-end=\"1096\"\u003e\n\u003cstrong data-start=\"1003\" data-end=\"1025\"\u003eFlexible Routing –\u003c\/strong\u003e Length designed for boats with complex wiring paths or larger hulls.\u003c\/li\u003e\n\u003cli data-start=\"1099\" data-end=\"1209\"\u003e\n\u003cstrong data-start=\"1099\" data-end=\"1130\"\u003eReliable Warning Delivery –\u003c\/strong\u003e Ensures the malfunction light turns on immediately when a fault is detected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1211\" data-end=\"1214\"\u003e\n\u003cp data-start=\"1216\" data-end=\"1233\"\u003e\u003cstrong data-start=\"1216\" data-end=\"1233\"\u003eCompatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1237\" data-end=\"1283\"\u003eAll \u003cstrong data-start=\"1241\" data-end=\"1281\"\u003ecatalyst-equipped MerCruiser engines\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1286\" data-end=\"1339\"\u003eDash-Mounted Catalyst Malfunction Light (8M0046481)\u003c\/li\u003e\n\u003cli data-start=\"1342\" data-end=\"1397\"\u003eSingle-helm installations requiring a 30-foot harness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1399\" data-end=\"1402\"\u003e\n\u003cp data-start=\"1404\" data-end=\"1440\"\u003e\u003cstrong data-start=\"1404\" data-end=\"1440\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1442\" data-end=\"1876\"\u003eThis harness gives you enough reach to route the malfunction-light connection cleanly from the engine compartment to the helm—even on large cruisers or deep-V hulls. Once connected, the warning light becomes a dependable early indicator—much like a check-engine light—alerting you the moment the catalyst system needs attention. It’s a simple, essential link that helps prevent minor issues from becoming bigger, more costly problems.\u003c\/p\u003e\n\u003chr data-start=\"1878\" data-end=\"1881\"\u003e\n\u003cp data-start=\"1883\" data-end=\"1898\"\u003e\u003cstrong data-start=\"1883\" data-end=\"1898\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1900\" data-end=\"2313\"\u003eCatalyst fault alerts must reach the dash accurately, and OEM harnessing ensures the signal stays clean. Mercury’s factory connectors, proper shielding, and correct wiring logic eliminate the guesswork and reduce the risk of false alarms or silent failures—issues that often show up with aftermarket cables. With an OEM harness, you’re getting consistent, reliable performance built for harsh marine environments.\u003c\/p\u003e\n\u003chr data-start=\"2315\" data-end=\"2318\"\u003e\n\u003cp data-start=\"2320\" data-end=\"2327\"\u003e\u003cstrong data-start=\"2320\" data-end=\"2327\"\u003eFAQ\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2329\" data-end=\"2470\"\u003e\u003cstrong data-start=\"2329\" data-end=\"2377\"\u003eQ1: What does this harness actually connect?\u003c\/strong\u003e\u003cbr data-start=\"2377\" data-end=\"2380\"\u003eIt links the engine’s OBDM catalyst-warning circuit to the dash-mounted malfunction light.\u003c\/p\u003e\n\u003cp data-start=\"2472\" data-end=\"2634\"\u003e\u003cstrong data-start=\"2472\" data-end=\"2511\"\u003eQ2: Why choose the 30-foot version?\u003c\/strong\u003e\u003cbr data-start=\"2511\" data-end=\"2514\"\u003eIt’s the right choice for single-helm boats with long or complicated rigging routes where shorter harnesses won’t reach.\u003c\/p\u003e\n\u003cp data-start=\"2636\" data-end=\"2751\"\u003e\u003cstrong data-start=\"2636\" data-end=\"2685\"\u003eQ3: Will this work on all MerCruiser engines?\u003c\/strong\u003e\u003cbr data-start=\"2685\" data-end=\"2688\"\u003eIt works on any \u003cstrong data-start=\"2704\" data-end=\"2750\"\u003eMerCruiser engine equipped with a catalyst\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2753\" data-end=\"2851\"\u003e\u003cstrong data-start=\"2753\" data-end=\"2791\"\u003eQ4: Is the warning light included?\u003c\/strong\u003e\u003cbr data-start=\"2791\" data-end=\"2794\"\u003eNo. The light is sold separately (part number 8M0046481).\u003c\/p\u003e\n\u003cp data-start=\"2853\" data-end=\"3001\"\u003e\u003cstrong data-start=\"2853\" data-end=\"2887\"\u003eQ5: Is installation difficult?\u003c\/strong\u003e\u003cbr data-start=\"2887\" data-end=\"2890\"\u003eInstallation is straightforward—plug in the connectors and route the harness through standard rigging channels.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46936019566883,"sku":"84-8M0048057","price":25.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV701243.jpg?v=1698795792","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-harnes-1helm-30ft-84-8m0048057","provider":"PartsVu","version":"1.0","type":"link"}