What does it do when you try to start it? how many miles does it have on it?
The starter can be drawing so much current that the vehicle battery cannot start it by itself I recommend a starting system draw test be done, most qualified shops can do this test for very little or even free. You can have a corroded cable or a bad Ground Connection that is robbing your starting amperage Even though you have voltage you need AMPS to start the car
If this information is helpful please give me a fixya! rating I owned an auto diagnostics facility here in Seattle for 14 years I believe you will find my recommendation correct. Thankd You, Randy