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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.
Not enough tension, the bearing in it can go bad, or sometimes when the spring in it wears out it will **** sideways and not be in line w/ the other pulleys.
the little arrow is way past the range on the tensioner
If the arrow is PAST the wear range, the tensioner is not bad, your belt is stretched or you may need a slightly shorter belt. A bad tensioner would either squeal like a stuck pig (the bearing) or the belt would be really loose (the spring would be busted). Have you stuck an 18mm wrench down there to see if there is tension?