Help sirs. Kaka full charge ko lang ng battery para matest kung ok pa ba ang batterybor alternator. When idle voltage is 13.5, headlights on= 12.5, then kapag on ang headlights aircon and stereo nagiging 12.1-12.2 lang ang voltage niya. Is this normal? O mahina na pasok ng kuryente ng alternator? Thanks.


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