Hello everyone. I have a few questions regarding my 06 Myvi. Recently the battery indicator is on constantly by the instrument panel. Idle with AC off is normal but when the AC is on, the idle seems to be erratic. The RPM just drops and suddenly climbs back up erratically. Is this an issue with the alternator as it is slowly breaking down? Starting it is fine because the battery is new. I also think the car is still on its original alternator at mileage is currently at over 178,000 KMs. So if it is the alternator, how much am I expected to pay for a replacement. Thanks in advance.

Thanks for the replies everyone. Today I went to a electrical specialist and he diagnosed that my alternator is not charging at all. Decided to change to a recond unit.