I managed to get the Mazda home last night after working on it for half an hour. It did turn out being the positive battery cable--it was corroded really badly underneath the shielding. I ended up removing the cable from the terminal and cleaning it the best I could, then I clamped it back down really good. I'm still going to replace the battery cables and terminals because they're all in bad shape--I don't trust the temporary fix I made last night to hold for very long. It's been raining or sprinkling here most of the morning, and if it doesn't clear up I probably won't be able to get started today.
I've got a wisdom tooth (my second one) that's starting to come in, and it's killing me. My gums are swollen, and my jaw muscle on that side is in excruciating pain whenever I open my mouth more than about an inch. It's forcing me to be on a sort of diet--I can only eat soft foods that I can chew easily, and most of the time even that's too much to bear for very long, so I end up not eating very much. I absolutely dread going to the dentist to get it fixed--I had two teeth pulled when I was in 8th grade, and it was a very unpleasant experience. I think I'll wait it out and hope that it gets better. My last wisdom tooth never hurt quite this bad, but I was able to wait that one out.