Went to start the 'ol girl yesterday and she was trying for about 2 seconds and then everything went dead. Nothing. No lights. I thought after all the electrical work that I've been working on lately that I had run down the battery enough that trying to start her just killed the battery. I fully charged the battery overnight. I've been messing around with her all day today but I can't get anything. No headlights, turn signal, radio, dash lights, dome light all dead. I've tested everything with my voltmeter and everything is getting correct voltage. So power is travelling, but nothing is on. Very strange. Fuses and bulbs all still good. Any ideas what would cause this?