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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
My battery is running at 14 when i start up my car, according to my headunit. However, as i drive it drops down to 13.5 ish with the lights and radio amp and subs on. If i turn my heat on low, it goes down to 12.5. When i stop at a light, it goes down to 12 with the heat off, and 11.5 with the heat on. I just got a new alternator not even 6 months ago, and a new battery about 3 weeks ago. I opened the hood and it seems there is an unusual noise to the right, drivers side, not by the alternator. I dont know what to check or fix. Any thoughts?