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You do not need to modify the alternator if it is working properly. The voltage regulator controls the output of the alternator and it does function at low RPMs, if all systems are working properly. So if it is not charging at low RPMs you have a problem. Most auto parts stores will check your charging system free of charge.

You do not need to modify the alternator if it is working properly. The voltage regulator controls the output of the alternator and it does function at low RPMs, if all systems are working properly. So if it is not charging at low RPMs you have a problem. Most auto parts stores will check your charging system free of charge.

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