I believe the radio comes off of fuse number eight. Make sure it is still good and hasn’t perhaps been blown due to a wiring mistake. Also check the single fuse in the radio harness
I also think fuse number eight is a constant hot but that may not be the case. To eliminate confusion try testing with your key in the off position and then in the run position
have you taken a voltmeter to confirm you actually have voltage between your purple wire and your grounding location?
Larry