Fault Phenomenon: Hitachi crawler crane multiple electrical devices malfunction simultaneously, fuses blow frequently.

Troubleshooting Process:
– Checked wiring harness: harness worn, short to ground.
– Checked generator: rectifier diode shorted.
– Repaired harness, replaced generator rectifier bridge.

Root Cause: Generator rectifier component shorted, causing AC to leak into the DC system, combined with harness short to ground.

Required Parts: Generator rectifier bridge, electrical tape.