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My car wont start

I have a 1994 Nissan Pathfinder 3.0L 4x4.Long story short,alternator tests good,battery is good,starter is good.Not all the time but on occation it wont start. I can here the bendix kick in but it won’t turn over,when i jump it , it starts. I was told it sounds like a voltage issue,not enough power to the starter. Any ideas,what can iI do to check this?

About the only thing left is the cables.

And check the connections, remove and clean both ends of each battery cable.