What steps must I complete to use the "Alternator Check" feature with my battery charger? Support January 04, 2021 18:17 Updated Follow You should connect the battery charger to your vehicle, and turn both on. Subsequently, press the "Alternator Check" button, and you should get a reading. Related articles What does the reading mean that I receive while running an alternator check with my battery charger? What does the fault code on my battery charger mean? Instruction Manual for the L2AFC and L2AFCBST Fast Chargers How does my maintenance charger work? Comments 0 comments Please sign in to leave a comment.