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Hi Jerry,
Are all the connectors properly connected and are they also dry on the inside? Is the DVR box also dry?
A solid red light means that your battery voltage is too low for the parking mode function. When you turn on the ignition, do you get voltage on the yellow wire? If you connect a power bank, have you disconnected the DC converter?
If you read the SD card, can you see that recordings are being made? Do you see the K3’s wifi network on your phone when you turn on the ignition?
You can disconnect all components (remote control, GPS receiver, camera, etc.) one by one to see if the K3 works again. This way you can rule out whether one of the components has become defective and therefore does not allow the K3 to start up.