This happened first during a WOT run and turned off pretty much as soon as it popped on. Week later same thing happens but the light stays on, let car idle and the light turns off, start cruising back on. Serpentine belt looks new so I don't think a pulley is sticking and it has plenty of tension.
Does this sound like an alternator issue or battery? Any ideas? Drove for 5 minutes and voltage didn't continue to drop with light on. Thanks.
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