Mercury – Diagnostic Port Assembly | 10-Pin SmartCraft CDS Access | 8M0046339

Overview

Technicians need quick access to the SmartCraft network, and digging into a helm every time a boat needs diagnostics can get old fast. The Mercury 8M0046339 Diagnostic Port Assembly solves that by giving the boat a dedicated 10-pin access point for CDS tools. It mounts out of sight near the helm, stays protected, and makes service checks faster and cleaner without tearing into panels or pulling apart rigging.

Key Features

• 10-Pin Diagnostic Port – Provides a dedicated SmartCraft access point for CDS tools.
• CDS Junction Interface – Connects directly to the Mercury Computer Diagnostic System through a technician’s jumper.
• Hidden Helm Installation – Mounts behind the helm so service checks don’t require disassembly.
• SmartCraft Network Ready – Designed for any SmartCraft-equipped engine or helm system.
• Harness-Dependent Setup – Requires a run from the port to a 10-pin SmartCraft connection in the rigging.
• Clean Service Access – Gives technicians a simple plug-in port for quick diagnostics.

Compatibility

• SmartCraft engines
• SmartCraft junction boxes
• 10-pin SmartCraft harness connections
• Mercury Computer Diagnostic System (CDS)

Performance & Practical Benefits

This diagnostic port keeps service simple. By placing the connection behind the helm, technicians can plug in a CDS jumper without removing panels or hunting for tucked-away connectors. It keeps the network accessible but protected, reducing wear on original harness plugs and improving the consistency of module communication during diagnostics. It’s a small addition that makes routine checks smoother and faster.

Why Buy OEM

SmartCraft diagnostics rely on precise pin alignment and clean signal transfer. Mercury’s OEM port assembly matches the network’s electrical and mechanical standards exactly, ensuring the CDS system reads the engine and helm modules correctly. Aftermarket ports often create loose fits or unreliable contacts, which can lead to incomplete or inconsistent diagnostic results. The OEM assembly installs securely and performs reliably year after year.

FAQ

Q1: Where is this diagnostic port normally installed?
It’s typically mounted behind the helm, out of sight but easy to reach for a technician.

Q2: Do I need a special harness to connect it?
Yes. It requires a run from the diagnostic port to an existing 10-pin SmartCraft connection.

Q3: Does this port stay connected all the time?
Yes. It remains part of the network and is available whenever diagnostics are needed.

Q4: Will adding this port affect SmartCraft operation?
No. It simply provides access points and does not alter system behavior.

Q5: Is it suitable for saltwater boats?
Yes. When installed properly, it holds up well in saltwater and freshwater environments.