starter, alternator, or battery?

I have a problem with my fox body. The problem was on my way home from work. My car drove all the way to work fine. No problems. I go to get in my car to leave. It will not start. I hear the clicking sound that means a bad battery. The battery is a week old. Optima 12v battery. my lights would still turn on and my radio would turn on but would not crank. I still just for the hell of it try to jump it. It takes a jump. On my way home, I am at a light, and it kills in the middle of driving it. From this, I would think that would rule out the battery, because if the alternator was good, you should be able to drive your car without the battery so I don't think it is battery. Next. Could the up's have slowed the accessories so much that I need a higher amp alternator? I took the alt to auto zone last week when I had problems, tested it 3 times and it came back good. I tried to tap the starter with a rubber hammer to try to see if it was the starter but it is not even getting past the clicking so I don't think it is the starter. The only 2 electric things I have on the car is a simple cd player and an electric fan. The fan does come on when the key is on the on position. The guy ran it to the ignition. so I pull to the side of the road. I had the cable's back on to try to jump it. Could the alt be going on so that it was not charing the battery back and caused the battery to get low. I know it tested good at auto zone but it might not be enough alt for the up's? any thought of what it could be?

Also, what is the torque spec on the alt pulley? I could not find it in my manual

I want a 130 amp alt. Where would I get a 6g alt from? I checked 50 resto and some other companies and only saw the 3g. does anyone know the torque spec on the alt pulley

do you have to install the part # PA-9902 when you install a 3g alt. I read that on brothersperformance.com but it did not say anything like that on 50resto. it is just a wire kit. what kind of modifications do you have to make on the alt bracket to make it fit?

it was running like 6-7 volts. I am going to bring the battery to auto zone, let them trickle charge the battery and see if it holds a charge and I am buying a 3g alt today. What should I use to get that bracket clearance I need

can you please put that in lamen terms for me. lol. I understand a little of what you said but not most of it. and what do you mean when you say, don't disconnect the battery from an alternator?