when do you know that your alternator is bad on 2000 mercury mountaineer ill a light come on and where it's
http://www.fordservicecontent.com/Ford_Content/catalog/owner_guides/96ecoog1e.pdf Page 74.a symbol that looks like a battery-- a box with a - and + in it will light when charging system fault is detected, on the instrument cluster. Turn your key to 'run' but don't start the car, you should see it
you can also test it with a multimeter
engine running meter set to dc voltage. red lead to pos black to neg. should read more than 14v.
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