Help me diagnose electrical issue

Yesterday after going enough rounds to get into the finals my car wouldn't start and the batteries were drained. Today, after letting it cool down overnight the batteries showed 11.9 volts and as soon as I turned on the safety switch the starter began turning. After doing this 3 or 4 times, the starter remained off and I could run the starter normally.
Does this sound like some kind of internal short inside the starter?
(Mopar mini starter)

What's the "safety switch" ? Battery disconnect? Sounds like a short to power to the starter. I would inspect the wiring going from switch to starter relay.