Sierra Ignition Pack 18-99245 for Mercury/Mariner 2-Cylinder 40/50 HP Outboards, Replaces 18495A13

The Sierra 18-99245 Ignition Pack is a replacement ignition module built for Mercury and Mariner 2-cylinder outboard engines. This ignition pack governs spark timing and delivery for the engine's ignition system, and is a direct fit for 1992-1995 Mercury/Mariner 2 cylinder 40 HP and 50 HP outboard motors. It is designed as a bolt-on replacement, allowing installation in place of the original ignition pack without modification to the engine's wiring harness or mounting points. The unit measures 7 x 4 x 2 inches, making it a compact component suited to the switch box location on these outboard powerheads. Sierra 18-99245 cross-references to several Mercury/Mariner OEM part numbers, so it serves as a reliable replacement when an original ignition pack has failed or is being proactively replaced. Boat owners and marine technicians use this part to restore consistent ignition performance on affected Mercury and Mariner 2-cylinder outboards, and it is stocked as a straightforward like-for-like swap for the OEM component.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99245
• Product Category: Mercury Outboard Switch Box
• Fitment: Mercury/Mariner 2 Cylinder Outboards, 1992-1995, 40 and 50 HP
• Cylinder Count: 2
• Horsepower: 40 HP, 50 HP
• Installation Type: Bolt-On
• Item Dimensions: 7 x 4 x 2 inches
• Weight: 0.8 pounds
• OEM Cross Reference: 18495A13, 18495A11, 18495A2, 18495A4, 18495A5, 18495A6, 18495A8

Fitment

• Mercury/Mariner 2 Cylinder Outboards, 1992-1995, 40 HP
• Mercury/Mariner 2 Cylinder Outboards, 1992-1995, 50 HP

Replaces (OEM)

• 18495A13
• 18495A11
• 18495A2
• 18495A4
• 18495A5
• 18495A6
• 18495A8

Frequently Asked Questions

What engines does the Sierra 18-99245 ignition pack fit? It fits Mercury and Mariner 2 cylinder outboard engines from 1992-1995, specifically the 40 HP and 50 HP models.

What OEM part numbers does the Sierra 18-99245 replace? The Sierra 18-99245 ignition pack replaces Mercury/Mariner OEM part numbers 18495A13, 18495A11, 18495A2, 18495A4, 18495A5, 18495A6, and 18495A8.

How much does this ignition pack weigh? The Sierra 18-99245 ignition pack weighs 0.8 pounds.

What are the dimensions of the 18-99245 ignition pack? It measures 7 x 4 x 2 inches.

Is this a direct bolt-on replacement? Yes, the Sierra 18-99245 is a bolt-on installation, so it fits into the existing mounting location without engine modification.

Will the 18-99245 work on a 3 cylinder Mercury outboard? No, the Sierra 18-99245 ignition pack is built specifically for 2 cylinder Mercury/Mariner outboards, not 3 cylinder engines.

Does the 18-99245 fit both 40 HP and 50 HP Mercury outboards? Yes, this ignition pack fits both the 40 HP and 50 HP Mercury/Mariner 2 cylinder outboards built between 1992 and 1995.

Is the Sierra 18-99245 compatible with Mariner-branded outboards, not just Mercury? Yes, since Mariner outboards from this era share the same 2 cylinder powerhead and ignition components as Mercury, the 18-99245 fits both brands.

What does an ignition pack do on a Mercury outboard? The ignition pack (also called a switch box) controls spark timing and delivery to the engine's ignition system, and the Sierra 18-99245 replaces this component when it fails.

How do I know if my Mercury outboard needs a replacement ignition pack like the 18-99245? Symptoms such as hard starting, misfiring, or a complete loss of spark on a 1992-1995 2 cylinder 40 or 50 HP Mercury/Mariner outboard often point to a failed ignition pack that the 18-99245 is designed to replace.

What is included when I order the 18-99245? The order includes one Sierra 18-99245 ignition pack, sized 7 x 4 x 2 inches.