Mercury – Weather Cap | 12-Pin Protective Cover | 8M0178799

Overview
This little cap keeps an unused 12-pin plug from getting full of salt, spray, or general boat gunk. It pops on in a second and hangs on tight, so you’re not worrying about an open connector slowly corroding in the back of the boat. It’s one of those things you don’t think about until you need it, but it saves a lot of headaches later. Simple part, solid peace of mind.

Key Features
    • 12-Pin Protective Cover – Blocks water, grit, and salt from getting into the plug.
    • Moisture Barrier – Helps stop corrosion before it starts.
    • Firm Fit – Stays put even when the boat’s taking a beating.
    • OEM Materials – Built tough for real-world marine use.
    • Quick Install – Push it on and forget about it.

Engine & Boat Compatibility
    • Rig center systems
    • 12-pin harness connectors
    • Multi-engine digital layouts

Performance & Practical Benefits
An uncapped connector can collect moisture or grime pretty fast, so covering it keeps things cleaner and avoids weird electrical surprises down the line. It also keeps the rigging bay a bit more organized, which makes life easier when you’re crawling in there later. It’s a tiny bit of prevention that saves you from chasing problems you don’t need.

Why Buy OEM
OEM caps fit the connector the way Mercury designed it—no wobble, no cheap plastic, no guessing. They handle vibration, heat, and saltwater without falling apart. It’s the kind of thing you install once and don’t have to revisit.

FAQ
Q1: How do I know I need this cap?
A: If there’s an unused 12-pin plug sitting open, it should be covered, plain and simple.

Q2: Do I need tools or setup?
A: Nope—just dry the connector and push the cap on.

Q3: Does it hold up around saltwater?
A: Yes, give it a rinse now and then and it’ll last a long time.

Q4: Any tips for putting it on?
A: Make sure the connector’s clean so the cap seats all the way.

Q5: When should I replace it?
A: If it cracks, loosens up, or stops sealing out moisture.