Yep... battery, ignition switch or alternator (which caused the battery to go bad).
Eliminate the battery and alternator by checking them with a DMM. If the battery reads 12.6 volts from terminal to terminal, cables off, and cables on, car running same test voltage should read 13.6 - 14.5 volts (alternator voltage), any other values and this is your problem.
If these check out, then it's the switch.
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