. ATTACHMENTS, OPTIONS EXTERNAL POWER SOURCE TYPE ELECTRIC HEATER CIRCUIT DIAGRAM FOR EXTERNAL POWER SOURCE TYPE ELECTRIC HEATER (1) (2) (3) Engine oil pan heater (0.6kW) Coolant heater (1.5kW) Engine oil pan heater (0.6kW) (4) (5) Terminal box (2.7kW) Female connector for external power supply 6 - 99