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Did you keep the original belt or did you throw it out yet? I would compare size at store. Either that or a bearing is going in another accessory? Hard to tell without being there to see what is making it walk off.
 

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It was the belt that was the wrong size. Funny, but I had run this belt for years and now it decides to come off.
I believe the alternator voltage was the deciding factor on the belt size.
The correct belt was a 955, I had a 970 on it.
The key to knowing you have the correct size belt is the arrow on the tensioner, it should line up at the mark 2 straight lines(||)at the middle of the solid (non-rotating) part of the tensioner. See picture.
Oh for the love of gawd. I have done that by accident too. Its like walking into a screen door when you thought it was open. Then you look around to see if someone seen you do that. :oops:
 
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