1.ECU power
2. Ignition power
3. starter soenoid
4. Fuel Pump
5. Rdaiator Fan 1
6. Radiator Fan 2
these six 6 circuits would just run the engine, thats assuming you dont have any oi cooler fans, water pumps etc.
then add in just a handful of lighting circtuis, front, rear run, whip and you are...