Update:
So John two days ago, (at a campsite deep in the Alaskan woods where nobody knew I was, yeesh) turned the key in ignition, and it turned over once, and then a buzzing noise. Waited a second, tried again and it fired up and drove away. Did the same thing the next afternoon. That same day, at night, I turn key in the ignition, and a buzzing, no click. It jump starts, and I drive home. Today it wont start, so I do my check and voltage is as stated above, and I roll start it a few times in second gear. Main fuse is not blown, after eventually it fails to roll start OR jump start. My shop teacher and job foreman told me that, due to turning key in ignition both step one and two, the lights got much dimmer, that it almost certainly made the battery the culprit, as weak, and that my 12.8V reading may be misleading due to an internal short in the battery, between cells. As a side note, shop foreman told me there was the possibility of breaking the timing chain doing a few repeated roll starts, downhill, as I did, additionally, I have to admit pulling a boner, I was running my DMM on amperage, with pos lead to B+ terminal on the alternator, and the negative lead to the frame of vehicle and it killed the engine. Not sure here, if that may have rendered damage. Update complete. (running jumpers right now to try and charge up and start car.) Also, not sure why, if it's just the battery that's dead, I cannot roll start the vehicle again.