about freelander charging system

[excellence]

what can cause battery light showing on the dashboard permanently and discharging the battery......for freelander 2 3.2...

[excellence]

we have replaced a new alternator and still behave the same and its ECU controlled....

[excellence]

halo! my freelander 2 chasis no. SALFA23A27H006636 ,when i start the engine it runs for a while then the battery light comes on and shows permanently on the dashboard .I have replaced a new allternator but still it behave the same way .I am away from the dealer ,what do you think could be the problem and possible solution...