Several months ago my Civic's battery light would come on intermittently. I hooked up a voltmeter to the alternator and had my daughter drive around while I checked the readings. When the light would come on, the voltage would drop to about 11 or 11.5 volts.

Fast forward to this weekend. I pulled the alternator Friday and took it to a starter and alternator repair shop that a friend had recommended. When I picked it up, the guy said he replaced the voltage regulator which had gone bad. I install the alternator and the battery light stayed on the whole time but was charging about 14v. I hooked up the voltmeter again and had my daughter drive around. When driving, it would read 13.7 volts. When at a stop sign, it would drop to 12.7 When we parked on the driveway it dropped to 12.5 after idling for a few minutes.

Does it sound like this alternator is still bad? Or could it be something else? Thanks in advance for the replies and advice.

 

Take the alternator back to the repair shop.