Fault Phenomenon: Nichiyu FB15P electric forklift connected to charger, charger shows fault code, cannot start charging, no instrument response.

Troubleshooting Process:
– Checked charging plug: pins not burnt, good contact.
– Checked battery fuse: fuse blown.
– Checked battery cells: voltages balanced.
– Checked charger output: output voltage normal.

Root Cause: Blown battery circuit fuse, or open circuit in charging plug internal wiring.

Required Parts: Battery fuse or charging plug.