Battery light is on - 1999 Plymouth Grand Voyager

Battery light is (more accurately) also named charging light or generator light.
One side of the light is connected to the battery via the ignition switch and the other is connected to the alternator. When the ignition is switched on, one side of the light is at battery voltage and the other side at 0 volts and so the light illuminates but when the engine starts and the alternator produces a full output both sides of the light is at the same voltage and so no current flows and the light is extinguished.

Assuming there are no wiring or connection problems your alternator isn't producing a charge. Perhaps you didn't need a new battery...

I don't know about cars

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The battery light is on to warn the driver that the alternator is not charging the battery. If the light is still on you need to check the output of the alternator. It may still not be charging the battery.

check battery volts see if battery volts are 12.6 volts.battery could be weak or battery cables and battery post terminals need cleaning.

On this issue i suggest you to get the battery and its connections checked.
Either battery is got weak or the problem is related to loose battery connections.Some times battery connectors gets dirty and cause no connection issue.So disconnect battery terminals,clean them and reconnect and check ,if that is helping.
Also if the battery is got very old,then try with new battery.

For more detailed help,related to these issue,i suggest you to click the help links provided below:-----

Battery light stays steady ON? http://technoanswers.blogspot.in/2012/02/ford-ranger-battery-light-stays-steady.html

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Battery Light and ABS Light on Dash http://whoisbyme.blogspot.in/2012/07/battery-light-and-abs-light-on-dash.html

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Battery Warning Light Flashing on Dash? http://whatisbyme.blogspot.in/2012/05/2007-toyota-rav4-battery-warning-light.html

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Service Battery Warning Light On Dash? http://whoisbyme.blogspot.in/2012/06/service-battery-warning-light-on-dash.html

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How to Inspect Car battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-inspect-car-battery.html--------- How to Test Car Battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-test-car-battery.html--------- Car Battery Servicing? http://repairhelpcenter.blogspot.com/2011/12/car-battery-servicing.html--------- How to Replace Car Battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-car-battery.html-------- How to Inspect Car battery Terminals? http://repairhelpcenter.blogspot.com/2011/12/how-to-inspect-car-battery-terminals.html-------- How to clean car Battery terminals? http://repairhelpcenter.blogspot.com/2011/12/how-to-clean-car-battery-terminals.html---------- How to Replace Broken Car Battery Cables? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-broken-car-battery.html

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These details will help.
Thanks.

Battery lights only come on if the alternator is faulty usually not to say the batterys duff i would get the alternator checked as well as the battery

Break light is no joke have the brake system checked for internal and external leaks . If none are found then itspossibly the brake hand / foot switch.

Battery lite could be incorrect battery or alternator is defective or the wiring behind alternator is corroded and lastly voltage regulator may be defective.

check the wire from the battery to the starter to see if it has good connection. otherwise check your ground to block.

No, and a new battery may not cure the battery light being on. A low or no charge condition will turn the red battery light on, a bad battery will not. A low charge condition could have turn the check engine light on. I would have it checked before I would start replacing parts.