Sierra 18-5817 Solenoid, Vertical Post Angled Bracket, for Mercury/Mariner Outboard Circuit Breaker and Fuse Applications

The Sierra 18-5817 is a vertical post solenoid with an angled bracket and stepped mounting plate, built for Mercury/Mariner outboard electrical systems. It is designated for use on applications equipped with a circuit breaker and fuse, making it a direct fit for outboard starter circuits, Mercruiser starter circuits, and Mercruiser power trim systems that call for this configuration. The corner-mount design and stepped mounting plate allow the solenoid to be installed in tight engine compartment spaces where bracket orientation matters.

This solenoid switches high-current loads (such as the starter motor or trim pump) using a low-current control signal, protecting the ignition switch and wiring from the heavy current draw of the starter or trim motor. It carries the Sierra brand designation 18-5817 and is manufactured to match OEM electrical and mounting specifications for the applications it covers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5817
• Manufacturer: Teleflex Marine
• Item Type: Solenoid
• Post/Terminal Style: Vertical Post
• Bracket Style: Angled Bracket
• Mounting Type: Corner Mount, Stepped Mounting Plate
• Application: Circuit breaker and fuse applications
• Fits: Outboard starters, Mercruiser starter, and power trim
• Item Dimensions (L x W x H): 7 x 6 x 3 inches
• Weight: 0.33 pounds
• UPC: 030999622174
• Included Components: Solenoid

Fitment

• Mercury/Mariner outboard electrical systems requiring a circuit breaker and fuse configuration
• Outboard starters
• Mercruiser starter circuits
• Mercruiser power trim systems

Replaces (OEM)

• SW058
• 7240
• 9-15112
• 9-15112-10
• 89-94318
• 89-846070
• 89-96158
• 89-96158T

Frequently Asked Questions

What does the Sierra 18-5817 solenoid fit? The 18-5817 is built for Mercury/Mariner outboard applications with a circuit breaker and fuse, and it also covers outboard starters and Mercruiser starter and power trim circuits.

Is this solenoid a direct OEM replacement? Yes, the Sierra 18-5817 cross-references to Arco SW058, GLM 7240, Mallory 9-15112 and 9-15112-10, and Mercruiser/Mercury Marine numbers 89-94318, 89-846070, 89-96158, and 89-96158T.

What are the dimensions of the 18-5817 solenoid? The 18-5817 measures 7 x 6 x 3 inches (length x width x height).

How much does the 18-5817 solenoid weigh? It weighs 0.33 pounds.

Does the 18-5817 use a vertical or angled post? This solenoid has a vertical post design combined with an angled mounting bracket.

How is the 18-5817 solenoid mounted? It uses a corner mount with a stepped mounting plate, which lets it fit into tighter bracket locations on the outboard or stern drive.

What is the difference between the 18-5817 and the 18-5818? Both are the same solenoid design, but the 18-5818 is specified for applications where an off white solenoid housing is needed; the 18-5817 is the standard version for circuit breaker and fuse applications.

What is the difference between the 18-5817 and the 18-5820? The 18-5820 is the version specified for design II applications, while the 18-5817 is used for circuit breaker and fuse applications.

What is included when I order the 18-5817? The package includes one Sierra 18-5817 solenoid.

Will the 18-5817 work on a Mercruiser power trim system? Yes, the 18-5817 is listed to fit Mercruiser power trim applications in addition to outboard and Mercruiser starter circuits.

What brand manufactures the 18-5817 solenoid? The 18-5817 is a Sierra brand part, manufactured by Teleflex Marine.

Does the 18-5817 replace the Mercury Marine 89-96158 solenoid? Yes, Mercury Marine 89-96158 and 89-96158T are among the OEM numbers the Sierra 18-5817 replaces.