Hi everyone, I have here a 2002 Jetta 2.0l, and the battery is not keeping charge. Now I know this is usually an alternator problem. However I have replaced the alternator and the the new one tested fine, (90 amp alternator) and passed all tests at auto-zone, and placing the new alternator in, still didn't help. The battery should be reading about 14.2V on the multi-meter, and it started off at about 12.89 or so and would slowly decrease while the car was running. The battery is also brand new and tested okay at auto-zone as well.
Now I have checked all of the connections and they're clean and solid as well as secure.
Not sure if there is some wiring issues or fuses that could blow in between, that could cause the problem.
And no there is nothing turned on in the car that would lead to a parasitic drain. So that option is out the window.
If you have any solutions you can think of. That'd be great