Kindly refer to this link for the 4-PIN Mapping RUTX11 Input/Output - Teltonika Networks Wiki (teltonika-networks.com)
If you don't want to use this if its available its easy to identify the wires because it is colored differently :)
4-way Power cable | Teltonika Networks (teltonika-networks.com)
You can install it in the ignition wire of the car and the GND of the car.
I hope it helps.