Why alternator not showing any voltage or charging battery?
1990 Dodge W150

Why alternator not showing any voltage or charging battery?

(1990 Dodge W150)
1987 Dodge ram 150 or 1500 pick up truck. I've put 2 new alternators in & neither one is showing voltage or what ever & isn't charging battery & my mechanics & I can't figure out why. please help?
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