I havea 2000 windstar ltd, 3.8l that has a bad alternator. I am confident I can replace it and have already bought a new replacement. Seems straightforward with one exception. I am not sure where to find the belt tensioner. The auto parts store gave me a tensioner tool I just don't want to do something stupid. Is there a diagram showing exactly where it is? Thanks in advance

 

The belt tensioner is normally located in the worse possible place (rear middle to botton of the engine).