Sierra Metric Adapter 18-99531 for Johnson Evinrude Outboard Ignition Systems

The Sierra 18-99531 is a metric adapter built for Johnson and Evinrude outboard ignition systems. It provides a reliable connection point within the ignition circuit, letting technicians and boat owners mate metric-threaded ignition components to the outboard's wiring or hardware without improvising a fix. The adapter is constructed of aluminum and plastic, giving it a solid, corrosion-resistant body paired with an insulated plastic section where electrical isolation is needed.

Sold as a single adapter per package, the 18-99531 is a compact, lightweight component at just 0.1 pounds, making it easy to keep on hand as a spare for ignition service and repair work on Johnson and Evinrude outboards. Because it is purpose-built for these ignition systems, it drops into the ignition circuit in place of the original connector without modification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99531
• Item Type: Metric Adapter
• Material: Aluminum, Plastic
• Weight: 0.1 pounds
• Number of Items: 1
• UPC: 736983856173
• Application: Johnson and Evinrude outboard ignition systems

Frequently Asked Questions

What is the Sierra 18-99531 metric adapter used for? It is a metric adapter for Johnson and Evinrude outboard ignition systems, used to connect metric-threaded ignition components into the ignition circuit.

What is the Sierra 18-99531 made of? The adapter is made of aluminum and plastic, combining a durable metal body with an insulated plastic section.

How much does the Sierra 18-99531 weigh? The Sierra 18-99531 metric adapter weighs 0.1 pounds.

Does the Sierra 18-99531 fit both Johnson and Evinrude outboards? Yes, the Sierra 18-99531 is designed for use on Johnson and Evinrude outboard ignition systems.

What is included when you order the Sierra 18-99531? One Sierra 18-99531 metric adapter is included per package.

What is the UPC for the Sierra 18-99531 metric adapter? The UPC for the Sierra 18-99531 is 736983856173.

Is the Sierra 18-99531 an OEM part or a replacement adapter? The 18-99531 is a Sierra-branded adapter for Johnson and Evinrude ignition systems, sold under Sierra's own part number.

Can the Sierra 18-99531 be installed without modification? It is built to connect directly within the Johnson or Evinrude ignition circuit as a metric adapter, without requiring modification to install.

Is the Sierra 18-99531 a lightweight, compact part? At 0.1 pounds, the Sierra 18-99531 metric adapter is a compact, lightweight component that is easy to keep as a spare part.