The test steps of diesel generator set are listed below. Manual start 1. When the indoor temperature is below 20 ℃ , open the electric heater and preheat the machine. 2. Check the body and surrounding for any obstruction of the operation of debris, if any should be removed in time. 3. Check crankcase oil level, fuel tank oil level, radiator water level. If the oil level is below the specified value, it should be replenished to the normal position. 4. Check that the fuel supply valve and the cooling water stop valve are in the open position. 5. Check that the battery pack voltage for starting the electric motor is normal. 6. Check the test button of the distribution screen and observe whether the alarm indicator is turned on. 7. Check that the switches on the distribution screen are in the opening position and that the meters are in zero position. 8. Start air inlet and exhaust. 9. Press the start button of the engine to start the engine. If the first start fails,