Mercury & Mariner Outboard External (Boat-Side) Wiring Harnesses

Rig your boat with confidence using marine-grade CDI brand external wiring harnesses engineered for today’s outboards. This category covers the complete path from your helm to the engine—including control-box-to-engine main harnesses, key-switch & ignition leads, trim & tilt pigtails, gauge and accessory jumpers, plus NMEA 2000 and brand-specific network adapters. We stock popular pin formats and lengths to fit classic and late-model engines from Mercury & Mariner. Outboard rigging is only as reliable as the wiring that ties it together. With the proper external harness, you’ll get crisp starts, stable gauge readings, smooth trim response, and a tidy rigging tube that’s easy to service season after season.