64 valiant v200 no power.

Does ANYTHING operate? Brake lights? Dome? Headlights/ tail/ park?

I assume, please confirm, does ANYTHING come on with the key? In the "run" position? in the "accessory" position?

The symptoms are important as they can help run this down. Possibilities:

If no power anywhere, blown fuse link or problems in the big RED ammeter wire going through the bulkhead connector, the ammeter connections or the ammeter itself, or the so called "welded spice" which is in the large BLACK ammeter wire a few inches from the ammeter.

Simplified diagram from the MAD electrical site:

http://www.madelectrical.com/electricaltech/amp-gauges.shtml