I have an RV Water Pump that operates on 12VDC and draws a maximum of 7 amps (from a deep-cycle lead-acid battery power source). The pump says to put a 10 amp fuse in the circuit for protection.
I keep blowing the fuse attached to the positive terminal in my 2014 Nissan Navara ST-X 550. I changed the starter motor, but after three weeks the fuse went again. This fuse on the battery is there ...