No Crank, No Lights, No Click, Battery Not Dead?

Went through a continuity test through the circuit. Turned the key on (car currently has "no power" due to this mystery short), and went from battery, to relay, to starter, to bulkhead, under dash, to ammeter. Power all the way up through the bulkhead connector, then nothing. No voltage readings from ammeter. Something under the dash is doing this, or perhaps it's the ammeter itself? I "think" I saw my welded splice (little thing of wires taped up) but I did not cut open the tape to further examine it...I will do more once the sun comes back up tomorrow. Got pictures of my ammeter connections and they don't look corroded or brunt (although one bolt was a little dirtier), and feeling up there they were nice and tight. Wish I could continue because it might just "fix" itself tomorrow morning....happened today! Car dead in the night, went out this morning and light comes on, able to start.

My bulkhead connectors:



Bulkhead plug...corroded one was the ammeter:


Finally, my ammeter connections: