I have a vw mk4, the battery is not charging but the alternator is ok, it was test and it was ok, all the connectios are fine too, fuse box over the battery is ok, i have no idea where too look, anyone can help please!!!!
What voltage do you get at the battery with the car running?
If you alternator is working and you are getting full voltage at the battery and it wont take a charge then the battery is most likely bad.
I am not sure but I think the alternator should be directly wired to the battery, so if you are only getting 12.8 I would re test the alternator.
At an idle mine charges at 14.4
I would check and make sure all of your connections are good. Make sure your frame ground is clean and tight.
There is a voltage regulator in the alternator than can go bad.
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