Fuse for radio

Thanks.....

My comment was not, "what can it carry before becoming a lightbulb", but what is acceptable for continuous load at a voltage.
Basics......small wire carries low load.....fuse keeps wiring from igniting.
Big wire carries larger load and/or less voltage drop.
Fuse/breaker keeps from a wiring fire.

Huge wire is a minor weight penalty.
Huge wire may be a PITA to run/fit/connect.
Huge wire does NOT "overwork" a device.....the device only uses what it needs until failure...thus.....a fuse or breaker.

Would anyone here use a 12ga jumper cable when car has a dead battery?!?!
Well.....off in neverland, cold, rainy, etc......I would try rather than quibble.
Going to welding cable with suitable clamps would likely yield a better result.....

Have a great day....