I have installed the alternator after that causes dash board light not working and audio is not working either.
Runs fine? No dash lights when starting?
May need to have its code re-entered after its power was disconnected during the repair. See owners manual.
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You do know that there are some on this site that will throw rocks at you for telling someone to look in the owners manual 
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Where’d you get the alternator? Many aftermarket units are junk.
Check for blown fuses. I hope you disconnected the battery before the work.
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If you are talking about the battery warning light not working then you most likely have a bad alternator. The warning light circuit needs to ground through the alternator in order to make the light turn on.