According to the wiring diagram, the battery feed wire to the ignition switch is 12 gauge. According to
This Chart a 6 ft long (probably longer than the actual length) can handle up to 30A. At 4 ft long, a 12 gauge can handle up to 50A, so the ignition switch is likely rated for somewhere between 30A and 50A. I have never seen a published rating for the ignition switch.
