Battery drain on '86 Taurus

[morengin]

The car sat for about 8 months, and when I went to start it, the battery was dead. Charged it up and it started right up. I then drove it around for about an hour and parked it. The next day......same thing.
I then disconected the negative battery terminal and put a volt meter between the cable and the battery and it was showing a 12.86 volt drain. I have pulled all the fuses (one at a time) and have not found the source. I also disconected the alternator and saw now change.
Any other ideas?
Thanks for your time, Jim

[mikeemon]

There is always low level drain from techy components. Check how many amps are being drawn. The battery may just be dead. Try load testing the battery.

[Alex_Perry]

the battery is most likely dead. Either that, or check the voltage regulator. I had one of those go bad on me, too. Its on the inside of the fender under the hood, on the driver side.

[Plesso]

I had this problem on a Chrysler once . . .turned out to be a bad electrical harness. Basically, all the "major" wiring. About $500 to replace it.