After replacing Alternator,the battery indicator light Comes ON dash?

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The reason the battery light is on is that the charging system voltage is below the battery voltage, this means the charging system is not working correctly, since you already replaced the Alternator for I assume the same problem, unless you got a defective rebuilt the charging system problem is not the Alternator but lies elsewhere in the electrical system. Use a volt meter and check the voltage at the battery cables with the engine running at high idle (at least 1000 RPM) the voltage should be at least 13.4 to about 14.2 Volts DC. This is also most likely the cause of the light that is on dash.But if All checked ok,then yes it can be faulty alternator,try with another alternator and confirm.------------
This details will help.Thanks.
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For more battery alternator testing and troubleshooting problems,Check the list mentioned below :----

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html

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http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

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http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-alternator-on.html

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http://vwrepairhelp.blogspot.com/2011/11/how-to-remove-voltage-regulator-on-car.html

How to Replace an Alternator Belt

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-alternator-belt.html

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http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html

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http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

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http://schematicsdiagram.blogspot.com/2011/11/car-battery-loosing-its-charge.html

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http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html

How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html