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Do you know what gauge the positive battery cable is?
It should be at least "O" gauge which is pretty big. Don't use a standard off-the-shelf battery cable that is for a 12 volt system. Those are too small in diameter for a 6 volt system.
I misdiagnosed slow cranking on my PV. Just by chance after cranking I touched the new 12V cable that I had installed. It was pretty hot. Lost a lot of electrical power to that heat. Changed to a proper O gauge cable and it has cranked fine since. Indeed a 6V starter does not turn as fast, but it is plenty to get the car started.
Maybe this will help.
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