Sierra 18-99290 Switch Box for Mercury/Mariner 65 HP 3-Cylinder Outboards, Replaces 332-4796A3, 332-4796A6, CDI 114-4796

The Sierra 18-99290 is a switch box built for 3-cylinder Mercury and Mariner outboard engines. The switch box is a core ignition component that manages spark timing and delivery for the outboard's ignition system, and replacing a worn or failing unit restores reliable starting and running performance. This switch box is designed for 65 hp Mercury/Mariner outboards from 1972 to 1975, matching the engine family's original ignition specification.

The Sierra 18-99290 cross-references directly to Mercury OEM part numbers 332-4796A3, 332-4796, and 332-4796A6, and is interchangeable with the CDI Electronics 114-4796 switch box, giving buyers multiple ways to confirm they are ordering the correct part. It weighs 1.8 pounds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99290
• Category: Mercury Outboard Switch Box
• Engine Configuration: 3 Cylinder
• Compatible Horsepower: 65 hp
• Compatible Years: 1972 to 1975
• Compatible Make: Mercury, Mariner
• Weight: 1.8 pounds
• UPC: 736983850560

Fitment

• Mercury/Mariner, 65 hp, 1972 to 1975

Replaces (OEM)

• 332-4796A3
• 332-4796
• 332-4796A6
• 114-4796

Frequently Asked Questions

What is the Sierra 18-99290 switch box designed for? The Sierra 18-99290 is a switch box for the ignition system of 3-cylinder Mercury and Mariner outboard engines, controlling spark delivery for the engine.

Which Mercury outboards is the 18-99290 switch box compatible with? It is compatible with 65 hp Mercury/Mariner outboards from 1972 to 1975.

What OEM part numbers does the Sierra 18-99290 cross-reference? The 18-99290 cross-references to Mercury part numbers 332-4796A3, 332-4796, and 332-4796A6.

Is the Sierra 18-99290 the same as the CDI Electronics 114-4796? Yes, the Sierra 18-99290 and the CDI Electronics 114-4796 switch box are interchangeable parts.

How much does the Sierra 18-99290 switch box weigh? This switch box weighs 1.8 pounds.

Does the 18-99290 fit 2-cylinder Mercury outboards? No, the Sierra 18-99290 is built for 3-cylinder Mercury/Mariner outboard engines, not 2-cylinder configurations.

What years of Mercury/Mariner outboards use the 18-99290 switch box? Outboards from 1972 to 1975 use this switch box, specifically the 65 hp 3-cylinder Mercury/Mariner engines.

What UPC is assigned to the Sierra 18-99290 switch box? The UPC for the Sierra 18-99290 switch box is 736983850560.

What category of part is the Sierra 18-99290? The 18-99290 is categorized as a Mercury outboard switch box, an ignition system component.