Quote:
Originally Posted by GonzoF1
I am certain that it's NOT the battery cables.
I suppose it could be my old direct drive starter. I have brand new a gear reduction starter that is a backup. Maybe now is the time to press it into service.
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What makes you so certain it's not the battery cables? And how about the connections? How about the negative cable attached to the engine?
"Throwing" parts at a problem in the attempt to correct it is a very inefficient way of troubleshooting.
Monitor the battery voltage (at the battery) when trying to start the engine. Now monitor at the starter and engine ground when trying to start the engine.
I see three possibilities:
1) Battery doesn't have the necessary capacity to start the engine.
2) A voltage drop between the battery and the engine.
3) A mechanical problem with the engine making it harder to rotate than it's supposed to be.