broke my alt...????

so i was driving home and all of a sudden my lights were flickering and my volt gauge was bouncing, and the alt gauge was flickering around. so i limped it home while watching my gauges thinking my belt was loosening up or something. so i get it home and the hood up and all looks fine. the belt is there and tight, battery cables fine, starter post chk, so i wiggle the alt charge cable and the whole back part connected to the "pos" post is loose!!!

so my question is can i fix it?

or can i buy a new one/preferably like a 60amp instead of the stock 68 dart 270 SL6 alt? 35 amp, or will it fry the amp gauge?

thx guys!! sry it so scatter brained... my grandma is on her death bed...