Mercury – 10-Pin Weather Cap | Harness Port Protection | 888507T

Overview

Unused harness ports can collect moisture and grime faster than most people realize, especially around the transom or rigging bay. The Mercury 888507T 10-Pin Weather Cap closes off those open connections and keeps the electrical system cleaner over the long run. With a built-in mounting tab, it stays secure and out of the way, giving any exposed 10-pin plug point the protection it needs in a wet, high-vibration environment.

Key Features

• 10-Pin Sealing Cap – Covers open 10-pin harness ports to keep out water and debris.
• Mounting Tab – Allows the cap to be secured so it does not dangle or pull loose.
• Junction Box Ready – Sized for harnesses that normally plug into SmartCraft junction boxes.
• Clean Electrical Protection – Helps prevent corrosion and signal issues caused by open connectors.
• Durable Marine Build – Made to hold up to heat, spray, and constant movement.
• Quick Install – Push-on design makes covering unused plugs fast and simple.

Compatibility

• 10-pin Mercury harness connectors
• SmartCraft junction box harness ports
• Unused engine or helm rigging plug points

Performance & Practical Benefits

This cap keeps unused connectors protected so they stay clean and ready if needed later. It prevents stray water, salt, and dirt from creeping into the plug cavity, which helps avoid electrical noise or corrosion problems down the road. The mounting tab keeps the cap secured, even in tight rigging spaces where vibration can shake lesser caps loose.

Why Buy OEM

Connection integrity is critical in SmartCraft and modern Mercury harnessing. The OEM cap fits the 10-pin shape exactly and seals the opening properly, something generic caps rarely do. Using the factory piece ensures the connector stays dry, tight, and ready for future use without causing false readings or intermittent communication.

FAQ

Q1: When should this cap be used?
Any time you have an unused 10-pin harness plug or an open junction box lead, the cap protects the connection.

Q2: Does the cap need to be removed for service?
Only if that plug point is needed. Otherwise it stays in place full-time.

Q3: Will this help prevent corrosion on the terminals?
Yes. Keeping water and debris out of the connector greatly slows corrosion.

Q4: Does the mounting tab need to be secured?
Securing it is recommended so the cap stays put in high-vibration areas.

Q5: Can it be used in saltwater environments?
Yes. It’s built for long-term marine exposure.