Reference: For more information on the Caterpillar Electronic Technician (Cat ET), refer to Troubleshooting, "Using Caterpillar Electronic Technician (Cat ET) to Determine Diagnostic Codes".
Reference: Schematic, RENR7929, "Marine Multi-Station Control System Electrical System - Typical Dual Engine Installation"
Reference: Schematic, RENR7893, "Marine Multi-Station Control System Electrical System - Typical Single Engine Installation"
Reference: Schematic, KENR9511, "Marine Multi-Station Control System II Electrical System - Typical Dual Engine Installation"
When the troubleshooting procedure instructs you to “REPAIR THE HARNESS”, use the electrical system schematic for the vessel that is being serviced to trace the circuit. Perform continuity checks at the harness connectors in order to locate harness failures. At the connectors of the components, always check the ground circuit. Less than 5 ohms of resistance is required between the ground contacts of the connector and the frame ground. Excessive ground resistance that is greater than 5 ohms can cause incorrect diagnosing of problems.
During troubleshooting, inspect all connections before any component is replaced. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.