Have you ever checked before starting your alternators? If you expect a satisfactory operation of your sets, do not forget these: 
✔️Check the lubricating oil, coolant, and fuel oil levels. 
✔️Visually inspect the generator for any signs of damage, water, oil or fuel leaks. 
✔️Check the installed wiring to ensure all connections are firmly installed in the correct position, and that wires are in good condition. 

✔️Double-check that all belts, guards and panel covers are firmly secured.