Thanks for the replies. I had it checked yesterday by an auto electrical shop near us (the one that replaced the alternator years ago) & they are measured it at around 14v when idle & 16v when revved (they use an analog multimeter). It looks like my little digital multimeter is broken, it is measuring 18v when idle. In any case, I would like to have it checked by another electrician.

Do you guys know of a good one near Quezon Ave area?

Yebo: the alternator was replaced, is the IC you are referring to in the alternator or in the computer box?

Thanks.