Alternator / Battery Mystery

[blizmop]

Here is a frustrating problem I am having:

I picked up a rebuilt alternator that was tested right in front of me as working.
I put it in and went for a 40km drive that drained the battery completely.
I figured the alternator was not working so I got it tested again, and again it was working.
I picked up a brand new battery to replace the original dead one.
So with my new battery and working rebuilt alternator I put the car back together. Result - no power.

I boosted the car from a truck and it ran. As soon as the jumpers came off the car died immediately. The brand new battery is only registering 5 volts right now and the car seems to be leaking the power constantly, even though all the accessories are off. There is no large stereo either. This happened all of a sudden too - the car was parked for a month and I had started it once per week until the final week when it would not start. Thats when I began this repair process.

So the question is: how can I find the leak? Or, whats the problem?
Any input would be greatly appreciated!

[blizmop]

So it turns out the brand new battery was dead - totally. I went through a hour and a half battle at Canadian Tire to get the stupid thing replaced, but I did. With the new-new battery in the car the volts register around 10 while running and around 11 while off. I drove for about 25 minutes with the accessories on to check things out and it held at 10 volts. The strange part is that whenever I put the rear defrost on, or applied all the accessories at the same time the volts would go as low as 5 or 6 - whether or not the engine was running.

The battery is still connected and when I go out in the morning I am anticipating a dead battery. We will see.

[corning_d3]

Get another alternator.. It could be fine on the tester with no load, but load it up with all your accessories and it could demand too much from it.

[blizmop]

Problem solved - the power line from the alternator to the battery was shorted just after the fuse at the starter. Replaced it and all is well. It was a waste to replace the alt and bat