Sierra Trigger for Mercury Mariner 6-Cylinder Outboards, Part 18-99432

The Sierra 18-99432 is a trigger assembly built for Mercury Mariner 6-cylinder outboard engines. As part of the ignition system, the trigger works with the flywheel to signal the engine's timing components, helping the engine fire correctly at the right moment in each cylinder's cycle. Replacing a worn or failing trigger is a common step when diagnosing ignition issues such as hard starting, rough running, or intermittent misfires on applicable 6-cylinder Mercury Mariner outboards.

This part is sold under Sierra's marine parts line, which supplies replacement components for outboard and sterndrive engines. It is cataloged specifically for 6-cylinder Mercury Mariner applications, so it is intended as a direct fit for engines in that configuration rather than a universal part.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99432
• Product Name: Mercury Mariner Trigger - 6 Cyl.
• Category: Mercury Outboard Stators & Triggers
• Weight: 0.5 pounds
• UPC: 808282394639

Fitment

• 6-cylinder Mercury Mariner outboard engines

Frequently Asked Questions

What engines does the Sierra 18-99432 trigger fit? The Sierra 18-99432 is built for 6-cylinder Mercury Mariner outboard engines.

What does a trigger do in the ignition system? A trigger works with the engine's flywheel to signal the ignition system's timing components so each cylinder fires at the correct point in its cycle.

Is the 18-99432 a genuine Sierra part? Yes, part number 18-99432 is manufactured and sold under the Sierra marine parts brand.

How much does the Sierra 18-99432 trigger weigh? The Sierra 18-99432 trigger weighs 0.5 pounds.

What symptoms suggest the trigger needs replacing? Hard starting, rough running, or intermittent misfires on a 6-cylinder Mercury Mariner outboard can point to a failing trigger such as the Sierra 18-99432.

Is this trigger sold as a single component? The Sierra 18-99432 is sold as an individual trigger assembly under its own part number.

Does the Sierra 18-99432 work on 4-cylinder Mercury outboards? No, the 18-99432 is cataloged specifically for 6-cylinder Mercury Mariner outboard engines, not 4-cylinder models.

What category of part is the 18-99432? Sierra part 18-99432 falls under Mercury outboard stators and triggers, the ignition-timing component group for these engines.

Can I look up the Sierra 18-99432 by its UPC? Yes, the Sierra 18-99432 trigger carries UPC 808282394639.

Is the trigger the same part as a stator? No, a trigger and a stator are different components within the same ignition system category; the Sierra 18-99432 is specifically the trigger, not the stator.