MidwestMyriad

I have a 1991 240sx, the car was driven 150 miles to my parents for thanksgiving, then sat for three days. When I started the car, everything was fine, drove about 8 miles to the store, car sat for about 2 hours. Came back outside and car started fine. Then as I was driving home the dash lights started to dim as well as the headlights. Then the radio started shutting off and the car began to sputter and cutout. When the lights were turned off the hesitation would lessen. Got the car limped home and while it was sitting in the driveway it eventually died. Now the car will only start with a jump and after about 5-10 minutes of idling it cuts out again....Battery is an interstate that is less than 2 years old. Haven't replaced the alternator yet, is this the problem? 75A fuse for alt. is still good. IF the problem is the alternator, will a new battery at least carry enough amps to get me home(assuming i dont use the headlights or radio etc.)

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@MMyriad