Project - Analysis of a practical automotive wiring circuit

Answer number 4:

I recommend battery 41.67 Ah (amuman 42Ah).

Answer number 5:

I see in this figure battery and ammeter is parallel conection. In parallel conection current is same in both device and provide right current information.

Answer number 6:

I see in this figure battery and starter is series conection because supply voltage more than more battery to starter and starter to battery.