Mercury – Malfunction Light Harness | 40-Foot Single-Helm Cable | 84-8M0048058Mercury Malfunction Light Harness 40 Foot Single Helm Cable 84 8M0048058 Overview Large 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 40 feet 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