Sierra 18-5808 Medium Starter Solenoid, Replaces OMC 395419, 582708, Mercury 47886T

The Sierra 18-5808 is a medium-duty starter solenoid engineered to deliver reliable high-current switching for outboard starter circuits. As a direct replacement component, it restores proper connection between the battery and starter motor, addressing the common failure point where a worn or corroded solenoid prevents an outboard engine from cranking. The solenoid is built to the same fit and function as the original equipment it replaces, so it installs using the existing mounting points and wiring terminals without modification.

This solenoid is designed as a cross-reference match for OMC and Mercury Marine part numbers, making it a straightforward swap when the original unit fails or shows signs of pitting, sticking contacts, or intermittent starting. Keeping a correctly matched solenoid on hand helps avoid downtime caused by a no-crank condition, which is one of the most frequent electrical issues on outboard-powered boats.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5808
• Product Name: Solenoid, Medium
• Weight: 0.65 pounds
• Category: Evinrude Outboard Starter Solenoids

Fitment

Cross-referenced to OMC and Mercury Marine starter solenoid applications; confirm your existing part number against the replaces list below before ordering.

Replaces (OEM)

• OMC 395419
• OMC 582708
• Mercury 47886T

Frequently Asked Questions

What does the Sierra 18-5808 solenoid replace? It is cross-referenced to OMC 395419, OMC 582708, and Mercury Marine 47886T, so any of those original part numbers can be replaced with the Sierra 18-5808.

Is the 18-5808 an OEM or aftermarket solenoid? The 18-5808 is a Sierra-brand replacement solenoid built to match the fit and function of the OMC and Mercury Marine originals it cross-references, rather than being sourced from OMC or Mercury Marine directly.

How much does the Sierra 18-5808 solenoid weigh? The Sierra 18-5808 solenoid weighs 0.65 pounds.

Will the 18-5808 fit my Evinrude or OMC outboard? Yes, if your outboard's original solenoid carries one of the cross-referenced numbers OMC 395419 or OMC 582708, the Sierra 18-5808 is the matching replacement.

Does this solenoid work as a Mercury Marine 47886T replacement? Yes, the Sierra 18-5808 cross-references directly to Mercury Marine part number 47886T.

What is included when I order part 18-5808? Ordering 18-5808 gets you a single Sierra medium starter solenoid; no additional wiring or mounting hardware is included.

Why is my outboard failing to crank, and could the solenoid be the cause? A worn or corroded starter solenoid is a common cause of no-crank conditions on outboard engines, and replacing it with the Sierra 18-5808 is a standard first step when the starter itself tests good.

Is the 18-5808 solenoid described as 'medium' a different size than other Sierra solenoids? Yes, the 18-5808 is designated by Sierra as a medium solenoid, distinguishing it from other solenoid sizes in the Sierra lineup that use different part numbers.

Can I cross-check the 18-5808 against my old solenoid's part number before ordering? Yes, check your old solenoid for OMC 395419, OMC 582708, or Mercury Marine 47886T; any of these confirms the Sierra 18-5808 is the correct replacement.

What category of part is the Sierra 18-5808? The Sierra 18-5808 is listed under Evinrude Outboard Starter Solenoids.