I use 20 amps per headlight, 20 amps per fan, and 20 amps for the ignition.
Nothing scientific in my choice. I never measured the branch currents. I know 20 amps gets the fuses out of the way of normal operation, they are basically there as safety devices in case of a dead short, preventing an electrical fire.
Be aware I revised the ignition power circuit since 2008 to energize two relays (in parallel) instead of one. One for the ignition as before, and a second for the electric choke.
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