You should check the current draw on the starter as well -- when
those direct drive starters get old, the resistance in the winding
goes up, they turn slow, and draw a colossal amount of current (2000A).
A grinding noise could be two things -- a bad starter over-run clutch
(those usually screech, though) or a bad ring gear -- either will
prevent starting. Could also be bad bushings in the starter that are
allowing the armature to contact the stationary coils, this will make
an amazing amount of noise and slow rotation.
Check the cables, too, but I would suspect a bad starter.
Peter
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