Starter issues
 

So I recently did a new hybrid turbo setup with an rtek 2.0. I also relocated my battery so I could do a front mount. After getting all that done I started the car and it worked fine for a day, the next day it wouldn't start.

I thought it was the battery so I jumped the car and it started, soon as I shut it off though it wouldn't start anymore, even after verifying the battery was good, and swapping out with other batteries.

The starter works great if I hook up a battery box/charger/jump from another car, it spins real fast, but will not spin without an external power source. I changed nothing that I can think of that would even remotely cause something like this in the time frame from when it worked to when it stopped.

I checked the battery cables and the grounds on the battery and the starter. Other than that, the car runs well and the alternator charges the battery and keeps the voltage constant. I have no idea what to check next!