The starter _might_ be bad, but the cabling is just as suspect.
There are at least three high-current cables involved, and all
should be tested for voltage drop while starting:
Bat+ to starter
Bat- to frame
Frame to engine
You can do it with two tests:
Bat+ (center post) to bolt end on starter
Bat- (center post) to engine block
You'll almost certainly need more than one set
of hands to do these tests correctly. Hint: none
of the contacts you make with the meter should
be to any part of any cables in question.
You need a fast-reading meter, one that can track
voltage fluctuations well. An old-school analog
meter is ideal, but a Fluke (with its analog auxiliary
scale) will do.
If you're losing anywhere near a volt in any of the
cabling, that's way too much.
-- Jim
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