Just a thought. Does the car have an undersized crank pulley which would not allow the alternator to turn fast enough at idle speeds? Next is to make sure the wiring to the alternator is perfectly clean, tight nut on output terminal and damage free regulator connector. Battery terminals must be clean and tight. Try to twist the battery connections once tightened.
Also North American batteries have smaller diameter posts compared to Japanese batteries which means you may have to install post shims... $5.00 aND 5 minutes work.
Lastly wiggle wires and connections at battery and battery main fuse unit and alternator to see if voltage fluctuates. Can't think of much else without seeing it. Hope that helps.
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