Question about 2003 Volkswagen Jetta TDI
Removed alternator and had alternator checked - alternator was good.
Found out that there was no power to the control wire on alternator.
Checked all the fuses in the fuse box, checked the fuses under the dash. Where do I go to next?
Your voltage regulator supplies the path for the control lead of the alternator and varies the amount of current available to provide the magnetic field of the armature with the required strength.
Measuring from this lead to ground won't show much voltage.
Apparently the regulator is not integrated into the alternator and is probably failed. If you can chase the control lead backward, you will find the regulator and these are mostly mounted on the fender well or firewall.
Posted on Jun 27, 2009
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Posted on Jan 02, 2017
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