Either that ground is bad or your cables are bad or the switch is bad OR needs adjusting. Slide the switch backward and see if that helps and then try sliding it full forward to see it that helps. Your problem is in the starter connections from the battery to the starter and you proved that by jumping it via an independent set of jumpers and having the starter turn over. Now you have to find the root cause. The only components are your cables, the switch, and the ground connections, assuming the battery connections are clean.The cround connection at the dash must be good AND the groud connection of the starter case against the engine block must be good fo the circuit to be closed. Don"t gibe up on the switch. I had a problem that required a switch adjustment.
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