batman wrote on 07/30/19 at 14:44:50: The heaviest draw on the bike (besides the starter) is you headlight -on high beam , which only draws 5 amps . So I would say 18ga rated for 10 amps @ 12 volts, to be OK for use anywhere as it would carry twice the draw of the headlight . the fuses only blow if you have a dead short , the entire battery (over 200+ amps) tries to flow through the wire thus blowing the 20 amp fuse instantly ,and doing it's job of protecting your wires from fire.
Awesome, and thank you for the detailed answer and explanation!