The fuse you use is determined by the load on the circuit and the size wiring used in that circuit not the battery voltage.
1997 Hyundai Elantra Battery Size: L4/1.8 battery (12V)
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
The 2009 battery was shipped with 12V / 532 CCA (Cold Crank Amps) battery.
The battery is a 12V car battery.
It is a 20 amp fuse and located in position 27.
obviously you need a bigger fuse and a bigger relay
12V 750a (I personally have a 1000a marine in mine).
There is not enough information. It depends on the type of battery: chemistry, cells, size.
Another 12v of the exact same size.
No, you can not charge a 3V battery with 12V charger.
10 −15 amp is a good size charger.
If I were doing it, I'd wire it in direct to the battery, and install a fuse in the wire somewhere (somewhere accessible) between the battery and the switch for the lights.