Sierra Ignition Coil 18-99174, Replaces 615475, for Chrysler Force Sears Gamefisher Outboards 2/3/4/5 Cyl

The Sierra 18-99174 is a replacement ignition coil built for Chrysler, Force, Sears, and Gamefisher outboard engines. It is designed to fit 2, 3, 4, and 5 cylinder powerheads, making it a common service part for older Chrysler/Force outboard lineups. The coil generates the high-voltage spark required to fire the spark plugs, and a weak or failing coil is a frequent cause of hard starting, misfiring, or a complete no-spark condition on these engines.

This coil uses a male connector and a clamp-on installation style, which matches the original mounting hardware on the covered engines. It is a direct fit replacement for the outboard applications listed below, and it cross-references to several Chrysler and Force factory part numbers, so it can be used to replace a worn or failed OEM coil without modification.

Because ignition coils are wear items that degrade with heat and vibration over time, keeping a compatible replacement on hand helps avoid extended downtime when a coil fails. Always confirm the engine's horsepower, cylinder count, and model year against the fitment list before ordering to ensure correct application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99174
• Item Type: Ignition Coil
• Cylinder Applications: 2, 3, 4, and 5 cylinder engines
• Connector Gender: Male
• Installation Type: Clamp On
• Fit Type: Vehicle Specific
• Weight: 0.6 pounds

Fitment

• Chrysler/Force 50 and 60 HP (2 cylinder), 1981-1992
• Chrysler/Force 80, 85, and 90 HP (3 cylinder), 1983-1991
• Chrysler/Force 90, 115, 120, and 125 HP (4 cylinder), 1981-1991
• Chrysler/Force 150 HP (5 cylinder), 1989-1992

Replaces (OEM)

• 615475
• 684475
• F684475
• F684475-1
• F615475
• 888791
• 300-888791

Frequently Asked Questions

What engines does the Sierra 18-99174 ignition coil fit? The Sierra 18-99174 fits Chrysler and Force outboard engines including 50 and 60 HP 2 cylinder models from 1981-1992, 80, 85, and 90 HP 3 cylinder models from 1983-1991, 90, 115, 120, and 125 HP 4 cylinder models from 1981-1991, and 150 HP 5 cylinder models from 1989-1992.

Is this coil a genuine OEM part or an aftermarket replacement? The 18-99174 is an aftermarket replacement ignition coil designed to directly replace the original Chrysler and Force coils listed in its cross-reference numbers, without requiring any modification to the engine.

What OEM part numbers does the 18-99174 replace? This ignition coil replaces OEM numbers 615475, 684475, F684475, F684475-1, F615475, 888791, and 300-888791.

Will this coil fit Sears and Gamefisher branded outboards? Yes, the 18-99174 is designed to fit Chrysler, Force, Sears, and Gamefisher outboards that share the same 2, 3, 4, or 5 cylinder powerhead applications listed in its fitment.

How much does the 18-99174 ignition coil weigh? The Sierra 18-99174 ignition coil weighs 0.6 pounds.

What type of electrical connector does this coil use? The 18-99174 uses a male connector and installs with a clamp-on mounting style that matches the original hardware on covered outboard engines.

What are the symptoms of a failing ignition coil on these outboards? A weak or failing coil on Chrysler and Force outboards typically causes hard starting, engine misfire, rough running, or a complete loss of spark on one or more cylinders.

Does the 18-99174 work on both 2 cylinder and larger multi-cylinder engines? Yes, the same 18-99174 coil is used across 2, 3, 4, and 5 cylinder Chrysler and Force outboard applications as listed in the fitment section.

How do I know if 18-99174 is the correct coil for my outboard? Match your outboard's horsepower, cylinder count, and model year to the fitment list for the 18-99174: it is not a universal part, so confirming these details first prevents ordering the wrong coil.

Is installation of the 18-99174 straightforward? The 18-99174 uses a clamp-on installation type with the same male connector as the original coil, so it mounts using the existing hardware on the applicable Chrysler and Force outboard engines.