From the looks of things, I'd say that your alternator pulley is misaligned. You need to make sure that everything lines up with a straightedge when everything's in tension.
You could also be misaligned, vertically, with the idler. But the alternator, from the picture, appears to be oul of true. If you think about it, objectively, you can visualize what could give you that pattern.
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Rich
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