Short on Circuit 7 (not six) - 1974 Plymouth Valiant Scamp

The car I recently bought, got running and drove around the block had a blown fuse in circuit 7 (not six) when I bought the car. I started digging in today with my mymopar wiring diagram. I found one of the wires from the trunk light switch seemed to be rubbing on sheetmetal and I suspected was shorting, so I disconnected that connector and put a new fuse in. It did not blow immediately, and I noticed the flashers inside the car seemed to be flashing, but only the left arrow inside was illuminated, and several lamps are either missing or burned out. But by the time I could start looking at those, I heard the ignition buzzer start buzzing and a few seconds later, the fuse burned out again.

I'll start tracing things through the ignition switch next. I've already seen some suspect splices under the dash from a previous owner, but I thought I'd ask here in case there are any common known issues I should track down first.

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