Question about Cars & Trucks
If a battery light comes on it usually means the battery is not being charged. i would take the battery out and take it to a place that sells batteries and get it checked. Should be no money charge for that . If the battery is good then check the alternator and see if it is working. Could be both are bad.
Posted on Dec 17, 2016
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Posted on Jan 02, 2017
SOURCE: Battery Charge
The best way is to get a voltmeter and check the voltage of the battery with the truck running and not running. When the truck is running, the voltage across the battery terminals should be aboput 14.9 volts (showing the alternator is charging the battery). With the truck off, the battery voltage should be about 12 volts (showing that the battery is holding the charge). From there, you should be able to tell which is bad.
Posted on Aug 14, 2008
Is it a remanufactured alternator. It sounds like you either got a faulty alternator or a wire is hooked up incorectly to it. I would test the voltage on the new one to make sure it wasnt a lemon If you are sure the wires are hooked up correctly.
Posted on Mar 15, 2009
In my case, the instrument cluster was bad, causing the MFI display and radio to go haywire and putting a contstant drain on the battery. $760 to have the VW shop replace it. No problems related to the battery or alternator have occurred since.
Posted on Apr 23, 2009
Replace your battery when its being tested there not testing it under a heavy enough load. A battery could have a dead cell in it and still show good on the charger. I've had that problem a few times.
Posted on Jul 07, 2009
What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.
Posted on Aug 04, 2009
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