2006 mazdaspeed 6 turning over when ignition is off
 

OK guys I have hit a brick wall with my car. 2 weeks ago I did a motor swap on a 2006 mazdaspeed 6 and everything went well and I put roughly 200 miles on the new motor and then one day I went to go start the car and it acted like the batter was dead. When I tried to jump the car nothing happened. I figured I wasn't getting a good enough connection with the jumper cables so I put a good battery in the car and then I wasn't even getting the starter click anymore so I replaced the starter. After I got the new starter installed and hooked up the battery the car started to turn over on it's own. I double checked and cleaned all my grounds on the car and looked for a pinched/ shorted wire but couldn't find anything. I don't know what else it could be...