Alternators
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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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2005-12-08 19:22:47
2005-12-08 19:22:47

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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no, the light has nothing to do with the alternator working properly, the light is only to warn you that it isn't charging the battery properly.

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not charging the battery properly... check the alternator.

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Dead or weak battery? Alternator not charging battery properly?

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Your alternator might be bad and not charging your battery properly.

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Odds are, Yes, the alternator is not functioning properly. Have the charging system checked.

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If a battery light is staying on, it generally means that your alternator isn't charging properly. Be prepared to have to pay for a new alternator, and if it has been damaged, a new battery as well.

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take the car to a repair shop and have them put a battery tester on it. it may be the alternator or the battery the tester will tell

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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.

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If your battery is not charging properly the charging system warning light ( located just to the right of the " F " on your fuel gauge ) will light up . It is the picture of a battery

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No , for the battery to be charged the engine must be running . This means that your alternator , if it's functioning properly , is charging the car's battery as the engine is on/running .

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Only if your alternator is not working properly. If you are always charging your battery, check your alternator belt. That was the solution for my escort, a new $10.00 belt.

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The alternator is over or under charging.The alternator is over or under charging.

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alternator needs to be replaced. battery also might be a problem due to the alternator not charging it

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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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charging system not charging battery with new batttery, alternator and fuel pump. what will make that happen ?

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It is not really a battery light. It is a charging system light. It is on because the system has malfunctioned. Normally this means the alternator is not working properly.

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Is it charging, if not have you checked wiring to alternator.

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have the alternator and the battery checked

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The alternator is over charging. you need to have the charging sytem checked.

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Apparently the alternator is bad or the battery is shot, take the car to autozone and get a free charging system check.

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Have the charging system checked. Possibly loose or corroded wiring, a loose alternator belt, or a bad alternator.

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NO. The battery light as you call it is actually the charging system light. If it is staying on the charging system is not working properly. More than likely the alternator has failed. It really has very little to do with the battery.

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Check the voltage at the battery posts with the engine idling. It should read from 13.5 to 15.5 volts.

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Your vehicles primary battery will drain eventually causing it to not start. If you drive for a long time with a dead alternator the vehicle can (rarely) shut off.


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