What was the original reason that made you change the starter? If you are seeing 10+ volts at the battery with the key in the start position that starter should be spinning. Unless you have something like a bad neutral start switch or cable connection.
Now if that ten volts was just, open the hood and test the voltage with the key off follow Johnny's advice and get it load tested, ten volts usually indicates a very low battery or a bad cell in that battery.
Tuesday, January 17th, 2017 AT 3:12 AM