Sierra Ignition Trigger 18-99446 for 2-Cylinder Chrysler, Force, Gamefisher 40 HP and 50 HP Outboards

The Sierra 18-99446 is a 2-cylinder ignition trigger built as a direct replacement for the trigger assembly on select Chrysler, Force, and Gamefisher outboards. The trigger is a core component of the ignition system, generating the timing signal that tells the ignition module when to fire each cylinder. A worn, cracked, or intermittently failing trigger commonly causes hard starting, missing, stalling, or a total no-spark condition, and replacing it with a properly matched unit restores correct ignition timing and reliable starting.

This trigger is designed for 2-cylinder outboard powerheads and is supplied as the trigger component only; it does not include the linkage bushing or ball, so buyers who also need those parts should plan to source them separately. It is built to match the OEM electrical and mechanical specifications of the original Mercury trigger it replaces, so it installs using the existing linkage and wiring without modification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99446
• Product Type: Ignition Trigger
• Cylinders: 2-Cylinder
• Weight: 0.6 pounds
• UPC: 808282396305
• Included: Trigger assembly only (linkage bushing and ball not included)

Fitment

• Chrysler, Force, Gamefisher 40 HP, 1996-1997
• Chrysler, Force, Gamefisher 40 HP, 1998-1999
• Chrysler, Force, Gamefisher 50 HP, 1996-1997

Replaces (OEM)

• Mercury 828301
• Mercury 854509
• Mercury 854509A9
• Mercury 855744A2
• Mercury 855744A11

Frequently Asked Questions

What does the Sierra 18-99446 trigger fit? The Sierra 18-99446 fits 2-cylinder Chrysler, Force, and Gamefisher outboards, specifically the 40 HP models from 1996-1997 and 1998-1999, and the 50 HP models from 1996-1997.

Does the 18-99446 trigger include the linkage bushing and ball? No. The 18-99446 trigger is supplied as the trigger component only and does not include the linkage bushing or ball, so those parts need to be sourced separately if needed.

What OEM Mercury part numbers does the 18-99446 replace? It replaces Mercury 828301, 854509, 854509A9, 855744A2, and 855744A11.

Is this trigger compatible with my Mercury outboard? The 18-99446 is cross-referenced to replace several Mercury OEM trigger numbers (828301, 854509, 854509A9, 855744A2, 855744A11), so it fits applications originally equipped with those parts.

How many cylinders is the 18-99446 trigger designed for? It is a 2-cylinder trigger, matching the ignition configuration of 2-cylinder Chrysler, Force, and Gamefisher outboards.

What symptoms indicate a failing ignition trigger? Hard starting, engine missing, intermittent stalling, or a complete loss of spark are common symptoms of a worn or failing trigger like the one replaced by the 18-99446.

How much does the 18-99446 trigger weigh? The Sierra 18-99446 trigger weighs 0.6 pounds.

Will the 18-99446 fit a 1998 40 HP Force outboard? Yes, it is fitted for Chrysler, Force, and Gamefisher 40 HP outboards from 1998-1999.

Can this trigger be used on a 50 HP model? Yes, the 18-99446 fits Chrysler, Force, and Gamefisher 50 HP outboards from 1996-1997.

What is the UPC for the Sierra 18-99446 trigger? The UPC for the Sierra 18-99446 ignition trigger is 808282396305.