chopper wiring

I recently found a 1972 XS650 in the trash and I am currently rebuilding it. All that is left is the wiring (I am building a chopper so it will only have headlight and tail light with no other accessories. I am picking up circuit breakers and I was wondering if I should use 10amp or 15amp manual...

I b I have Isolated the ignition circuit and unplugged the charging system .I Used a test light to try and feel like I did something right as voltmeter reading were less than a volt. This is debatebly inconclusive though because my volt meter did not react to key switch changes and my test...