Ignition Coil — Mercury Mariner 339-859738T1, 825101A2 | 4Boats

Aftermarket Ignition Coil for Mercury and Mariner outboards, designed as a direct OEM replacement to restore reliable spark and consistent engine performance.

• Compatible OEM Part Numbers: Mercury: 339-859738T1, 859738T1; Mercury/Mariner: 825101A2
• 2‑stroke engine fitment: 25 HP (2‑ & 3‑cyl, 1984–2006); 30 HP (2‑ & 3‑cyl, 1984–2006); 35 HP (2‑cyl, 1984–2005); 40 HP (2‑ & 3‑cyl, 1984–2006); 45 HP (3‑cyl, 1986–1994)
• 4‑stroke engine fitment: 25 HP (3‑cyl, 1999–2006); 30 HP (3‑cyl, 1999–2006); 40 HP (3‑ & 4‑cyl, 1999–2006)
• Product features: Direct replacement for OEM ignition coils; engineered to provide a consistent spark and reliable starts
• Applications: Ideal for Mercury and Mariner outboards used in boats, RIBs, inflatables and small craft
• Construction: Aftermarket unit built to meet or exceed OEM standards with corrosion‑resistant casing
• Fitment note: Fits selected 25–45 HP models; always verify OEM part numbers before purchase

Simple plug‑and‑play replacement — install following manufacturer safety guidance and verify full fitment by matching the OEM numbers listed above. See our Ignition Coils collection for related parts and accessories.