Partial Alternator Warning light

[zegalote]

With me happens the same. a friend told me its normal in this transits.

But now I've stopped her for 3 days and she went out of battery. I found it strange because the battery it's almost new. And I thought it was some faulty connection in my audio system. After I don't find any fault I was thinking on a faulty battery.

Now I read this threat that this could be a fault diode, Now I will check the alternator diodes.

thanks.