stallrocket

I have a 95 Legacy Wagon that decided to die on me. After having no problems, I got no crank one morning. To make a long story short, I replaced the battery, then the alternator. After a jump, I let the car run for about 2 hours. I took it for a ride around the block and lost all power. I jumped it again, but when I put the key in the ignition I go between losing all dash lights including the door open light and a start every 25 times I try. Do I have some kind of a short in the ignition system? The battery is fully charged yet I get nothing most of the time once I turn the key. Its almost as if turning the key kills all power. Thanks.