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In all of the designs I am aware of, there is nothing between the ignition switch and the battery except a fuse.
If you fried an ignition switch, it was probably defective unless you splice some kind of a high current drawing item inline without a relay. Generally speaking, you would not be running more than a few amps through an ignition switch, instead, you would use it to supply voltage to a relay which would only draw milliamps through the ignition switch.
John
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