2000 civic EX battery not charging battery, alternator tested out ok

[spakhnyuk]

So my 2000 Civic EX with a D17y7 engine is not charging the battery.

I went to check the alternator and found a rusty and almost broken connection (picture attached) , so I automatically thought that was the problem. I removed that plastic covered connector piece and hooked the wire lead strait to the alt. (the connection between the alt and the wire lead was fixed)

The voltage still read only 11.7 while the car was running, and the car died as soon as I disconnected the battery.

So I though the alt was bad and took it to O Riellys and it checked out fine.
Also took it to a Napa, and they said it was fine.

I checked all my fuses, nothing is blown. What else should I check to get this fixed?

 

[TokyoSkies]

That's almost certainly your alt, in my opinion. See if you can borrow someone's known good alt, and test it with that. Automotive stores have a history of mis-diagnosis.

 

[RealRabbit]

Where are you checking the output voltage? Make sure you're testing the voltage at the alternator itself. Also, if you had a corroded wire is it possible that the terminals inside are corroding? Try doing a resistance check on them as well. Also, disconnecting the battery while the car is running is a terrible idea. Thats an old school trick. Witch today's electrical systems and modern ECU's thats a good way to back feed and fry your ECU. When you tested the alternator did you do it on or off the vehicle, was it load tested? Also, I've had plenty of alternators test good and still be bad. Like TokyoSkies said its pretty common for a parts store to test them as good and they could really be bad.