Battery light - Cars & Trucks

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.

Measure the voltage at the battery with engine running, will be 14 volts, if it is still 12 check the wire at the back of the alternator and see if it is at 12 volts or 14.
you may have a bad alternator, advance auto parts and autozone will check it for free.