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
That's not 12 amps,that's 12 volts,which means the system isn't charging Measure the voltage across the battery terminals,if its charging properly,it will be between 13.8 and 14.7 volts,anything less and its not charging. Suspect then a faulty alternator or wiring problem. and have the battery properly recharged and tested too,a low battery will not give you a correct charging reading and a faulty alternator can take its toll on a battery.
The voltage gauge on the dash refers to the charging system voltage. What this most likely means to you is that your alternator is not charging properly. If the battery is new and all battery and alternator connections are good and corrosion free you can be relatively sure the alternator has failed.
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