Sierra Mercury Mariner Outboard Ignition Upgrade Kit 18-99348 - Fits Mercury 16 Amp V6 Engines

The Sierra 18-99348 is a bolt-on ignition upgrade kit engineered for Mercury and Mariner outboard applications, specifically designed to fit Mercury 16 Amp V6 engines. Ignition upgrade kits like this one are used when an outboard's charging or ignition circuit needs to be brought up to a higher amperage output, giving the engine's electrical system more reliable capacity for running accessories, electronics, and starting loads. The kit installs using a bolt-on mounting approach, so it integrates into the existing engine layout without requiring custom fabrication, and it terminates in a male connector for straightforward wiring into the boat's harness.

Built for marine service, the 18-99348 is intended for use on boats rather than automotive or industrial equipment, reflecting the corrosion exposure and duty cycle that outboard ignition components see on the water. At 5.9 pounds, it carries the weight of a complete ignition-side upgrade assembly rather than a single small component. Boat owners running Mercury 16 Amp V6 outboards use this kit to replace or upgrade their existing ignition setup with a part sized and connectored specifically for that engine family.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99348
• Product Type: Ignition Upgrade Kit
• Compatible Engine: Mercury 16 Amp V6 Engines
• Installation Type: Bolt-On
• Connector Gender: Male
• Vehicle Service Type: Boat
• Weight: 5.9 pounds

Fitment

• Mercury 16 Amp V6 outboard engines

Frequently Asked Questions

What engines does the Sierra 18-99348 ignition upgrade kit fit? The Sierra 18-99348 is designed to fit Mercury 16 Amp V6 outboard engines.

Is the Sierra 18-99348 a bolt-on installation? Yes, the 18-99348 uses a bolt-on installation type, so it mounts into the existing engine layout without custom fabrication.

What connector type does this ignition kit use? It terminates in a male connector for wiring into the outboard's existing harness.

How much does the Sierra 18-99348 kit weigh? The kit weighs 5.9 pounds.

Is the 18-99348 rated for marine use? Yes, its vehicle service type is listed as boat, meaning it is built for marine ignition applications rather than automotive or industrial use.

Will this kit fit any Mercury outboard, or only specific engines? Fitment for the 18-99348 is specific to Mercury 16 Amp V6 engines, not Mercury outboards in general.

Is the Sierra 18-99348 an OEM part or an aftermarket kit? The 18-99348 is manufactured by Sierra as an aftermarket ignition upgrade kit for Mercury 16 Amp V6 engines.

Does the 18-99348 require any modification to install? No modification is required since it is a bolt-on kit that installs using the engine's existing mounting points.

Can this kit be used on a Mariner-branded outboard as well as Mercury? Yes, the 18-99348 is built for Mercury and Mariner outboard applications with Mercury 16 Amp V6 engines.

What size or capacity upgrade does the 18-99348 provide? The kit is sized for Mercury's 16 Amp V6 engine ignition circuit, matching that engine family's electrical requirements.