Mercury – Dash-Mounted Catalyst Malfunction Light | Engine Alert Indicator | 8M0046481

Overview

Catalyst-equipped MerCruiser engines rely on a clear visual alert when the emissions system needs attention. The Mercury 8M0046481 Dash-Mounted Catalyst Malfunction Light gives you that reminder. When the catalyst system detects a fault, this light turns on—much like the check-engine light in a car or truck—letting you know it’s time to get the engine inspected. It’s simple, easy to see, and built for dashboards where a quick visual cue matters.

Key Features

• Catalyst Alert Indicator – Illuminates when the catalyst system detects a malfunction.
• Automotive-Style Warning – Behaves like a check-engine light, reminding you to schedule service.
• Dash-Mount Design – Installs cleanly on the helm for clear visibility.
• Harness Sold Separately – Works with specific single-helm harnesses.
• OEM Compatibility – Intended for MerCruiser engines equipped with a catalyst system.
• Reliable Operation – Provides a simple, direct status indication without extra displays.

Compatibility

• MerCruiser engines equipped with catalyst systems
• Single-helm harness options:
• 8M0048049
• 8M0048054
• 8M0048055
• 8M0048056
• 8M0048057
• 8M0048058
• 8M0048059

Performance & Practical Benefits

This indicator light gives you a clear, on-dash reminder that the catalyst system needs attention. It’s easy to spot even in bright daylight and offers a simple way to stay ahead of emissions-related issues before they turn into bigger problems. Once installed with the correct harness, the light activates automatically whenever the system detects a fault, giving you a straightforward alert without requiring a VesselView or multi-function display.

Why Buy OEM

Catalyst alerts are tied directly to your engine’s emissions and diagnostic systems—areas where accuracy matters. Mercury’s OEM indicator is built to match the electrical logic and durability standards the catalyst system expects. Cheaper aftermarket lights often fail early or don’t illuminate correctly, which can hide issues you should catch early. The OEM light gives you confidence that you’ll see the warning when you need it.

FAQ

Q1: What does the catalyst light actually mean?
It indicates the engine’s catalyst system detected a fault and should be inspected soon.

Q2: Does this light affect how the engine runs?
No. It only shows a visual alert—it doesn’t change engine behavior.

Q3: Do I need a special harness?
Yes. One of the specified single-helm harnesses is required for installation.

Q4: Is this only for catalyst-equipped engines?
Yes. Non-catalyst engines will not use this indicator.

Q5: Can this replace a digital display warning?
Yes. It provides a physical dash-mounted alert without needing a VesselView screen.