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2003 VW Jetta Charging problem

I have a 2003 VW Jetta TDI and replace the alternator. The batter is not getting a charge from the alternator. Could there be a fuse or voltage regulator that could have gone bad or blown that would cause this.

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  • Anonymous Jan 24, 2009

    I have a 2003 Jetta 1.8T, and the battery light comes on intermittently. I had the battery and the alternator checked, and all checked out okay. Not sure why the light keeps coming on.

  • atiba38 Feb 05, 2009

    I have 2003 jetta, changed the battery and alt. and still having the same problem. anyone....

  • jimsed Apr 12, 2009

    It appears that I have the same problem. My 2000 jetta tdi quit charging and I put on a new altenater. When I took the old altenater in they tested it and said it was good. Still put on the new one and the battery still does not get a charge? I read the post about the voltage regulator but think the new altenater has a new voltage regulater on it. Any Ideas? New altenater , new battery and no charge. An odd side note is that I do not get a battery warning light inside indicating that the altenater is nor charging even if I disconnect the altenater altogether.

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Problem is that the voltage regulators on the 1.8t which I am sure is the same on the TDI alternator....is that they may work fine when they are cold....but once they warm up is when they start acting up and causing problems. I assume is has to do with some resistor over heating. This is just a common problem noticed by most people over at VWvortex.com.
So you can take your alternator to get tested but if it is tested cold then well it may appear to be working ok. When in reality it is broken. Trust me...it is a cheap enough part and easy enough to fix to not just try it. Some can even change the regulator without taking the alternator out. If you have small enough hands I can see it being done.

Posted on Feb 20, 2009

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