If your hardwire kit has “power” and/or “accessory” and “ground” leads, get yourself a voltage tester and make sure that you connect the leads to the proper fuses.
Power = 12 volts on all the time (typically used for parking mode, if equipped).
Accessory = 12 volts on when the vehicle’s ignition is in accessory or on position (used to power the cam on and into continuous recording mode).
Ground = chassis ground needed to complete each circuit.
Use fuse taps like these to make your connections easy, fuse-protected and reversible...
Gebildet 4pcs 12V 24V Add-a-Circuit Micro2 Fuse Tap, Piggy Back Blade Fuse Holder with Wire Harness, 6 pcs Micro 2 Fuse (5A 10A 15A) and Fuse Puller
Best of luck to you!