Sierra CDM Module Test Harness 18-99554 Marine Ignition Diagnostic Tool

The Sierra 18-99554 is a CDI CDM module test harness built for diagnostic work on marine ignition systems. It provides the wiring connections technicians and boat owners need to check a CDM (capacitor discharge module) without cutting into or damaging the boat's existing engine harness. Keeping the factory wiring intact during testing helps avoid accidental short circuits or connector damage that can occur when probing wires directly.

This harness is part of Sierra's line of marine diagnostic tools and is intended for use by technicians and DIY boat owners performing ignition troubleshooting. It is a lightweight, compact tool designed to be kept in a toolbox or service kit for quick access during engine diagnostics.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99554
• Category: Marine Diagnostic Tools
• Weight: 0.4 pounds
• UPC: 808282395681

Frequently Asked Questions

What is the Sierra 18-99554? It is a CDI CDM module test harness, a marine diagnostic tool made by Sierra for testing CDM ignition modules, identified by UPC 808282395681.

How much does the 18-99554 test harness weigh? The Sierra CDM module test harness weighs 0.4 pounds.

Is the 18-99554 a genuine Sierra part? Yes, 18-99554 is the Sierra manufacturer part number for this CDM module test harness, not an aftermarket substitute.

What category of product is this? Sierra part 18-99554 is listed in the Marine Diagnostic Tools category.

What is a CDM module test harness used for? A CDM module test harness like the Sierra 18-99554 is used to connect diagnostic equipment to a CDI CDM ignition module for testing purposes.

Does the Sierra 18-99554 replace the boat's factory wiring harness? No, the Sierra 18-99554 is a test harness used alongside the existing wiring for diagnostic purposes; it is not a replacement wiring harness.

How can I identify the correct Sierra test harness for my CDM diagnostics? Look for part number 18-99554 on the Sierra CDM module test harness, and confirm it against UPC 808282395681.

Is the 18-99554 lightweight enough for a mobile toolkit? At 0.4 pounds, the Sierra CDM module test harness is light enough to carry in a marine technician's toolbox or service kit.