En 
SvChecklist Fuses
Do you have fuses closest to the positive terminal of the power source in all circuits?
- Charging circuit (approx. 100 - 400A)
- The bow thruster / windlass (approx 250 - 500 A)
- From the battery bank to the fuse box (approx. 35 - 100A)
- The refrigerator (approx. 35A)
- Heater (approx. 35A)