Noticed before sunset today I had no headlights. switched to high beams and are working. 2017 Nissan sedan s plus with 45000 mi. Is this under warranty? Also I noticed via my scan guage that my alternator was reading 14.6 v which higher than I usually read. Can an incorrect alternator kill your heads. I think the stealership did a number on me when they replaced my alternator. Whats a competent mechanic worth anyway? Stealerships can ruin your car be warned.