REPAIR DETAILS

I had just bought this RV from somebody and drove it home and it overheated and died like shut down. I replaced the thermostat and got an alternator but had not put the alternator in yet and got a starter because I thought that was the issue with why it wasn't starting and installed the starter incorrectly. But now I have it incorrect. Not sure if installing the starter incorrectly had done any damage. The car does nothing now when I turn the key and it didn't do anything before either though. So after it died I'm saying.