RANSOTO Ignition Coil Pack for Mercury & Mariner Outboards — 2-Pack for 6–150HP Engines, Direct OE Fit

The RANSOTO 18-5186 ignition coil pack is a two-piece replacement designed to restore reliable spark and engine performance in a wide range of Mercury, Mariner and Chrysler Force outboard motors.

If your outboard is misfiring, running rough, or won’t start, a worn or failed ignition coil is a common culprit. This RANSOTO coil pack set is built to match factory fit and electrical characteristics for many 6–150hp Mercury/Mariner models and multiple Chrysler Force engines, including late-1980s through mid-1990s variants. Sold as a pair, these coils replace OE part numbers such as 18-5186, 339-7370A13 and 339-832757A4 and come with a one-year satisfaction warranty.

Which engines and model years will these coils work with?

These ignition coils are cataloged to fit a broad spectrum of Mercury and Mariner outboards from small portable engines up to larger horsepower models, plus several Chrysler Force applications. Confirm fit by cross-referencing your engine’s model and the OE part number where possible.

• Mercury & Mariner coverage: 6–125hp, 140hp, V135, V150, 210CC, and many intermediate sizes.
• Chrysler Force coverage: 40–150hp ranges across 1989–1995 model years (specific models listed in product features).
• Direct replacements: compatible with part numbers 18-5186, 339-7370A13, 339-832757A4 and 339-832757B4.

How do these coils improve engine starting and performance?

Ignition coils generate the high-voltage spark needed for combustion; replacing degraded coils restores consistent spark timing and intensity. That can reduce misfires, improve throttle response, and help the motor start more reliably, especially when cold or under load.

• Restores consistent spark energy across cylinders for smoother running.
• Reduces intermittent misfires and rough idle caused by failing coils.
• Helps achieve faster, more reliable starting in varied conditions.

What should I know about installation and compatibility checks?

Installation is typically straightforward for mechanically experienced boat owners or marine technicians; coils mount in the ignition assembly and require electrical connectors and proper torque. Always disconnect battery power, compare part numbers, and inspect connectors and mounting points for corrosion before fitting new coils.

• Turn off power and remove negative battery cable before starting.
• Compare OE numbers and connector shapes to ensure proper match.
• Check and clean terminal contacts; torque bolts per manufacturer specs.

What warranty and after-sale support does RANSOTO provide?

RANSOTO includes a one-year satisfaction warranty with this coil pack set and asks customers to contact them directly if any issue arises. The warranty covers product defects and fit concerns, but routine troubleshooting (electrical testing, connectors) is recommended before returning parts.

• One-year warranty for defects and dissatisfaction.
• Direct seller support for fitment and replacement questions.
• Sold as a 2-piece set to match multi-coil ignition assemblies.

Who is this for: boat owners, DIY mechanics and marine service shops replacing failing ignition coils on Mercury, Mariner or compatible Chrysler Force outboards. If your engine matches the listed sizes and OE numbers and you want an affordable aftermarket replacement with warranty-backed support, this RANSOTO 18-5186 2-pack is a practical choice to restore reliable ignition performance.