With a voltmeter it is easy to follow the 12 volts from the battery through the 30 amp fuse up to the steering head area. There is a copper piece that goes bad between the battery cable bolt and 30 amp fuse holder. (the second 30 amp fuse is a spare)
What I'm not sure of is, if the kid was shorting out the battery at the battery there is no fuse protection there.
The key switch has been known to go bad, but the ass u mption is this is related to the battery install, right?