Wont start...91 integra gs

I got a 91 5pd integra GS and it doesn’t start but it will start if I put the jumper cable to my civic hatch for about 2-4 minutes, then it will start up and when i come out the next day to start it again it would not start, but the headlight and sunroof would work…also i live in alaska it’s about 70 degree’s average…any help thanks…also my AC belt broke so the belt is not there…thanks for reading and reply’s

probly the alternator