Part of: Sierra Switch Box for Mercury Outboard Engines Ignition Repair Parts
Other options in this family: Sierra 18-5775-1 Sierra 18-5777-1 Sierra 18-5790-1 Sierra 18-5776-1 Sierra 18-99222
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$321.54
In Stock (10+)
Usually delivered within 2 days
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The Sierra 18-5791-1 is a high-quality replacement switch box (ignition power pack) engineered for Mercury and Mariner 3-cylinder 2-stroke outboard engines in the 45–60 HP range. Designed to meet or exceed OEM specifications, this switch box restores reliable ignition performance and serves as a direct, plug-and-play replacement for worn or failed original equipment.
Key Features:
Replaces OEM & Cross-Reference Part Numbers:
Sierra is a trusted name in marine replacement parts, offering boaters and technicians dependable, cost-effective alternatives to dealer-priced OEM components. The 18-5791-1 switch box is an essential ignition system component, helping ensure consistent spark delivery and reliable engine starting for Mercury and Mariner 3-cylinder powerheads.
Ordering was easy, received item in a reasonable amount of time. Well packaged.
Mark W
Very good experience
John K
Fast shipping products exactly as described would definitely shop with again
Zeb
Got the part I needed pretty quick. Smooth transaction.
Shanice W
Do you have the part in stock that I needed right away with two day business delivery?
David K
Great Price ! Thanks!!
James M
No reply to my email with question about the part fitting my vehicle. Since the mfg part # matched I took a chance and ordered.
Weston S D
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