308C Excavator Electrical and Electronic System – Starting Motor Does Not Rotate – Troubleshoot

Problem: The starting motor will not rotate.

Solution: Check that the following connectors and components are connected properly: battery, starting motor, starter relay, alternator circuit breaker, starter switch, starter control relay, neutral start relay, “CONN 1”, “CONN 4”, “CONN 5”, “CONN 7”, “CONN 39” and “CONN 40”. If the problem still exists, use the following procedure to troubleshoot the system.

Illustration 1 g00851018

Illustration 2 g00851041

Illustration 3 g00851043

Illustration 4 g00851044

Illustration 5 g00856012

Schematic for “Starting Motor Does Not Rotate”