I have been having battery problems for a while now, I think I fixed one problem of getting charge from the alternator to the battery by replacing the alternator. But now I notice my voltage cannot get up to 13 volts with headlighs off. But the weirder thing is that I can start my Supra if I immediately turn my ignition on, but if I just leave the key to the on position (where the car is not on but electricity is flowing) for a few seconds the car will not start. The only sure way to start my car at any time is to turn on my headlights before i give it ignition. Does anyone know what's going on? Are there terrorists in my electrical system?