I'm having the weirdest issue right now with my 84 300d.

I went on vacation for 2 weeks, when I came back I went to start my car, and it started and then immediately died. At first, I thought the battery had died, because I was getting no lights or anything.

After replacing the battery, I had lights, and when I tried to start it, it didn't even crank. All the electronics just turned off. I noticed that if I disconnected both terminals on the battery and then reconnected them, I could get my electrical system working again, but any time I tried to actually start the engine, it would kill all the power again.

Does anyone have any idea what would cause this?