I was watching a YT video on the hardwire install.. and the gent said ..do not plug in the "power" slot...you have to plug in the "usb" slot to allow the camera to record when parked and engine is shut off?
Thats my understanding too, What ever you do when dont with the install, play around with the camera to familiarize yourself with it and make sure you are getting what you expect to get.
I am fairly new to parking mode use, but i also prefer the fairly new low bitrate recording, and then have G sensor on too to lock any actual events, cuz the low bitrate recordings are just treated as regular recordings are, so with a full card the oldest ones will go.
but i dont feel this is any problem with a ample sized memory card ( 256 GB )