well when i first built my 73 dart i was always having charging problems with the stock ALT, but mostly with not wanting to charge very good at idle. so i removed it and installed one of these. they are more money than a factory alt. But after i installed the new 120 AMP Alt i didn't have any more charging problems. Also this is a factory dodge part so any parts store should have on in stock. Also the new one would put out 14V at idle. Now i am not saying you have to do this, but just wanted to say it made a good difference on my car. here is the link to the one i used.