Sorry I can't help you with the alternator, but if you have a Pull a Part close by I think you can buy a used alternator from them for about $20-$25 and your old alternator. Another thing to consider is if the brushes in your old alternator are worn out it will not charge your battery, a new set of brushes only cost about $5 the last time I replaced them in my '88 Pony. The brushes are very simple to replace and you should be able to tell if the old ones are worn out just by removing them and seeing if they are worn pretty thin. then if they are go buy another set and put them in for a cheap fix.