My 98 model ford taurus wont start without a external battery connected to my existing battery.my existing battery is in good condition(confirmed with battery testing report),but the negative terminal have some issues.when i connect the external battery or jump start from other car the negative cable(black one) has to be connected to the engine block or car body instead of batterys negative terminal,which sound weird to me.what could be the reason for this?? plz help..
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