. OPERATION EXPLANATION OF COMPONENTS (41) 10A Room lamp No. Capacity Name of circuit (42) 10A Engine preheat power (43) 20A Yellow rotating lamp (if equipped) (44) 20A Side lamp (if equipped) (45) 20A Electric operator's seat heater (if equipped), Air suspension seat (if equipped) (46) 10A Payload external display lamp (if equipped) (47) 10A Tachograph (if equipped), cigarette lighter (48) 20A Air conditioner (49) 20A Spare (50) 20A Front wiper Fuse box V (Inside battery box) 3 - 51 Fuse box BT4 No. Capacity Name of circuit (51) 10A Power source for emergency system (52) 120A Power source for engine heater