fluctuating voltage on a 2010 montero

[j_dipad]

eto ang results sa readings na pinagawa ko, bumaba hanggang 12.5v then nag hold doon. This was on a steady idling rpm of 650. Kasi pag nag switch on ang aircon compressor, the idling rpm goes up to 800-850, and the voltage readings goes up to 13. Pag nag rev, tsaka pa lang aakyat to 13.5 or so. I will take this up with my suki repair shop on monday.

sir,any update po sa alt niyo? ganito din kasi prob ng oto ko ngayon,kahit nagpalit na ko ng surplus na alternator