Technical Question about the Ammeter

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mga kabayan,

tanong ko lang about sa Owner Type Jeep, ok pa ba yung kapag nag-sswitch ako ng headlight tapos yung ammeter ko goes on negative side, something like -10amps at idle? pero pagni-rev ko napunta sa zero? pero kapag wala naman headlight, something like parklight, foglight and stereoweak is just on, ok naman..nasa above zero range yung ammeter reading...ano kaya problema? battery? low ampere rate of alternator? or should I change my headlight into a low wattage..old school pa kasi yung headlight niya e yung bilog na sealed beam buong headlight assembly pa talaga, hindi yung type na may seperate bulb.

as long as nasa charging side when the vehicle is running, charging system is ok. confirm with voltage testing.