Sierra 18-99415 4-Cylinder CDM Trigger for Mercury Mariner 80 JET, 100, 115, 125 HP 1996-2006

The Sierra 18-99415 is a 4-cylinder CDM (Capacitor Discharge Module) trigger built for Mercury and Mariner outboard engines. This ignition component signals the CDM at the correct point in the engine cycle so each cylinder fires at the right time, making it a key part of the outboard's ignition timing system. It is constructed of plastic for durable service in the marine engine compartment.

This trigger is designed to fit Mercury outboards rated 80 JET, 100, 115, and 125 HP built in 1996-2006. It is a direct replacement for a failed or worn factory trigger and is intended for owners and marine technicians replacing ignition components as part of a tune-up or troubleshooting a misfire, hard-starting, or no-spark condition on a compatible 4-cylinder Mercury or Mariner outboard.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99415
• Product Category: Outboard Stator and Trigger
• Material: Plastic
• Number of Cylinders: 4
• Compatible Brand: Mercury / Mariner
• Compatible Horsepower: 80 JET, 100, 115, 125 HP
• Compatible Years: 1996-2006
• Weight: 0.6 pounds
• UPC: 808282394462

Fitment

• Mercury / Mariner outboards, 1996-2006, 80 JET, 100, 115, and 125 HP

Replaces (OEM)

• 134-4513-4
• 834821T
• 854513 T
• 855746A 2
• 855746A21
• 855748A 2

Frequently Asked Questions

What engines does the Sierra 18-99415 trigger fit? The Sierra 18-99415 fits Mercury and Mariner outboard engines rated 80 JET, 100, 115, and 125 HP built in 1996-2006.

Is the Sierra 18-99415 a direct replacement for the factory Mercury trigger? Yes, the 18-99415 is a direct-fit replacement trigger for the applicable 4-cylinder Mercury and Mariner outboards, and it cross-references to OEM numbers 134-4513-4, 834821T, 854513 T, 855746A 2, 855746A21, and 855748A 2.

How many cylinders is this trigger designed for? The Sierra 18-99415 is a 4-cylinder CDM trigger, matched to the 4-cylinder Mercury and Mariner outboards it is compatible with.

What is the trigger made of? The Sierra 18-99415 trigger is made of plastic, suited to the marine engine compartment environment it operates in.

What does a CDM trigger do on an outboard engine? A CDM trigger sends a timing signal to the ignition's capacitor discharge module so each of the engine's cylinders fires at the correct point in the cycle; on the Sierra 18-99415 this signal is provided for 4-cylinder Mercury and Mariner outboards.

What symptoms indicate the trigger needs to be replaced? Misfiring, hard starting, or a no-spark condition on a compatible 4-cylinder Mercury or Mariner outboard can point to a failed trigger, which the Sierra 18-99415 is designed to replace.

How much does the Sierra 18-99415 weigh? The Sierra 18-99415 trigger weighs 0.6 pounds.

Does 18-99415 replace part number 134-4513-4? Yes, 134-4513-4 is one of the OEM cross-reference numbers the Sierra 18-99415 replaces.

Will the Sierra 18-99415 fit a 150 HP Mercury outboard? No, the Sierra 18-99415 is compatible with Mercury and Mariner outboards rated 80 JET, 100, 115, and 125 HP from 1996-2006; a 150 HP engine is outside its listed fitment.

Is this trigger sold as a single unit? Yes, the Sierra 18-99415 trigger is sold as one unit.

What years of Mercury/Mariner outboards use this trigger? The Sierra 18-99415 covers model years 1996-2006 on the applicable 80 JET, 100, 115, and 125 HP Mercury and Mariner outboards.