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Last time the alternator died on my Saturn it didn’t turn on the battery light. When I noticed it I had been driving for about 5 minutes, and first symptom I noticed was rather odd. I’d set my cruise control, and 2 seconds later it disengaged. Did that about 3 times and started looking at my gauges, noticed my scangauge said 12.6, so I turned around and went back home. If I turned the engine off and key on I’d be in the 11s, restarted and I was showing 12.5 at idle, 4000rpm would get me 12.7-12.8. Only way the battery light to come on was to turn the headlights on at idle, I wanna say voltage had to be down to like 11.9 to light it up.
Replaced the alternator, everything was fine. My guess is that one diode or feild went out but 2 were still trying
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