Ok, so because the alternator (which is tested and good) was not charging the battery and a couple other small problems, I pulled the engine wiring harness out, and spliced in new wires where all of the old wires where the old ones were bad.

The old harness was all torn up, and a few of the wires were completely cut (by the alternator fan as far as I can tell). So I reconnected the wires as far as I could, rewraped the wires in insulation, and put it all back in the car.

Now, I have jumper cables going from the battery in another car to the terminals in the datto (no battery in the datto at the moment). At first nothing would happen, so I checked to make sure I was getting power from the battery in the other car (I did this by just touching the jumper cables together to make sure I had a spark) I did not get a spark, so I pulled the jumper cables off, started the other car to make sure the battery had a charge. It did, so I reconnected the jumper cables.

Now, first I tried turning on the headlights (before starting the car) and they did come on. But when I tried to start the car the e-brake light did not come on, and the headlights turned off. The headlights would not come back on after that, but I didn't try anything else, as I don't want to break anything.

So, before I start trying things, I was curious if anybody had any tips or anything as to what might be the problem. Or if anybody had a simple wiring diagram (the one in my manual is impossibly complicated) so anything that just show what wires go where in the engine compartment (I'm not doing the electrical work in the rest of the car yet).