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Hello, what year and modle vw do you have?
ok , have you verified voltage on the battery and generator output?
ok then you need to check the diodes and also make sure that it is in fact wired correctly from the gen light to the regulator. with a car that old i would wonder about wiring and connections.
ok i will opt out at this point, i wont be able to assist further, the diagrams i have are cruddy and i dont have much personal exp in the car other than the engine itself . another expert should be along soon.
Thanks for choosing Just Answer . I'm Wolfgang here to help!!Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail. Do not rate yet, just reply. Put yourself in my shoes, I can not see, smell, hear, feel or touch your car, nor do I know any history on it. So take into consideration I am doing my best based on what you tell me. Also understand fixing cars often requires sophisticated tools, that you may not own. So even if you can not do what is outlined in my answer, that does not mean my answer is wrong deserving to be rated negative.
i have some questions to ask first?
please let me know