Dash power running through Alternator gauge?

Wish you guys would stop believing those sweeping generalizations.

I recently pulled the gauges out of my 65 Dart to clean and paint the bezel. I thought the car had never been messed with but there was some modern, large gauge wires going to the Alternator gauge. One was hot coming from the wire bulkhead in the firewall and the other side went to what appears to be a cluster of wires behind the spedo. This looked questionable so I disconnected them from the gauge and sat them aside. Put the dash back together and now nothing works. No headlights, no ignition, no anything. Does all of the power run through that gauge? Doesn't seem right to me.
You just disconnected the battery power feed.
The ammeter is in the battery feed/charge line. It shows whether the battery is charging or disharging, or neither.
The '65 is a relatively good design and the fact the wires looked like new further suggests its in good condition.
Put it back the way you found it. Make sure the battery and alternator wires do not contact any metal housings. (ground)