A #10 stranded wire will handle about 30 Amps. I don't remember too many #10 or larger wires in the Spridget wiring harness, (starter and alternator, maybe?) The fuse should match the load and wiring capacity. http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/Data%20Sheets/Bus_Ele_DS_8005_Fuseology.pdf