Guys how will i know if may problem na alternator ko, bago kasi battery ko, yung green na motolite, pero minsan pag start ko nalalaglag rpm hangang mamatay engine (off pa aircon nun ha), parang walang power. pero pasumpong sumpong lang yun, minsan ok naman. sana naman di pa kailangan palitan alternator pero if ever magkano kaya magagastos sa alternator replacement? thanks.