Is the voltage good the the starter? For vehicles, I usually pull the starter and test it with a jump pack and a screwdriver. That will show if the starter is dragging.
"I had this theory. It was based loosely on the unremarkable observation that the old are always looking back with longing while the young, with the same longing, look ahead. One man remembers what the other imagines." Thomas Lynch, The Undertaking: Life Studies from a Dismal Trade
