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Try this: obtain a ground strap and attach it directly to bare metal on the firewall and bare metal on the engine. I would also attach one between the frame and firewall. You may be losing ground connection during wet weather. This won't cost you much to try. I hope this helps you. Mark you should also look at the condition of your belt, it may be slipping in the rain a very common problem with the mk2

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โˆ™ 2005-12-08 19:22:47
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Q: 1990 Jetta Automatic will not operate properly in the rain - charging light comes on when heat wipers rear defog etc are on - New battery - when last checked alternator - it was pushing out 12pt8 volt?
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