i left my lights on and drained the battery.jump started it.befor i could put cables away engine died i started it agin and noticed the battery light wasent going out and the engine would not stay running so icharged the battery about 45 miniutes and got it home.checked alternator and it was not putting out voltage so i replaced it with new rebuilt one from napa.it putting out about 14 volts but my battery light is still on it dim but on ,any clues as to what else it can be

 

What year Civic?

Is the alternator belt tight? Are all of the alternator mounting and adjusting bracket bolts tight?

Are the battery terminals clean and tight?

 

yes to all i am kinda wondering if the battery might be weak but it starts the car turns over good

 

What year Civic?

Measure voltage across the pos and neg battery posts under these three conditions when the engine is warm:

1) Engine off
2) Engine idling, nothing electrical on
3) Engine idling, high beams on, A/C on and blower set to Max