Volvo VNL 780 Operator's Manual page 462

452 MAINTENANCE AND LUBRICATION
W3030520
In situations where there is a short or overcurrent (over 100 Amps), the battery voltage
protection system will initiate a different audible and visual alarm. The alarms are activated
at a series of three 30 second intervals. If the short or overcurrent situation is not resolved by
the final alarm series, the LVD shuts down in order to protect the vehicle lectrical system. If
the system is shut down, you must perform a battery disconnect to reset the system.
In situations where overcurrent is the most likely cause (e.g., multiple pieces of electrical
equipment on at once), turn off all unnecessary electrical equipment. The system should
return to normal. If not, then turn off any remaining equipment and allow the system
to return to normal.
If you have turned off all unnecessary equipment, and the alarm is still active, then a vehicle
short is the most likely cause. Take the vehicle to a service center for maintenance.