If the alternator was faulty then the old alternator will not have been charging the battery properly. Charge the battery using a battery charger (one that plugs into the mains) or get a jump start form another car and once you are going run the car for a time to recharge the battery.
The alternator is going bad, may need to be replaced soon
old myth, bad for alternator, dont do this..
If it makes a loud whining, screaming, or grinding noise, it needs to be replaced. Before you do, verify that it is indeed your alternator and not a pulley or other engine component If you suspect low output is why it's bad, the only way to verify that your alternator is bad is to attach a diagnostics tool, or remove it and take it to a local automotive parts store. Most will bench test your alternator for free.
The problem isn't your batter or alternator or starter then. Start looking into your fuel management system. Possibly your fuel pump, injectors, etc.
Fuel injectors need to be replaced every so often. If the fuel injectors are not working, they may be too old, and need to be replaced or put in properly.
The regulator is in the engine computer not the alternator.
When you replaced the injectors, did ou also replace the O rings? Are the injectors seated down in there OK? Try twisting the injectors a little after you've seated them
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.
If it is melting over a period of time, try replacing the connector on the wire at the back of the alternator, or replace the wire and connectors. A little more info would be nice!!!
We replaced the alternator on 2 different vehicles. It was around $175 for each.
Inside the alternator
Inside the alternator, some are easily replaced and some are soldered in place.