Skyjack HB600‑24B is a 24‑V automatic switching‑mode battery charger used on scissor lifts and other Skyjack equipment. Common failures include overheating or thermal cutoff of the internal rectifier, failure of the charge control IC causing no voltage rise, and LED indicator faults that lock the unit in maintenance mode after full charge. For troubleshooting, first verify the input AC supply voltage and continuity to the charger terminals; next check the output battery voltage with a multimeter and inspect for any visible damage or burn marks on the PCB; finally review the status LEDs and error codes (if available) to confirm whether the charger is in normal operation or maintenance mode.[oss-gpt-20b]