Lost all electrical, then it came back. What's going on here?

Even if there was an internal CB in the wiper motor, how could that kill the entire car's electrical system?

Easily. If the firewall main connection, amp meter bolts, bad positive or neg. cable or fusible link is weak, it may not handle the high current load of a jammed wiper at say, 25 amp. The breaker trips at 30, resets as it cools, and then the wiper is off so the amp draw goes back to much lower.

Take a Packard 56 male connector and make sure the two main dash side connectors have tension. The heavy wires for the fusible link and alternator feed. If it slides in and out too easy, that Packard connector has overheated and lost tension. Replace it.

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