Cigarette socket at Center Console Wiring Questions

As I know, there is a white color plug that connected to the cigarette socket. I like to splice the positive wire and the negative wire from the new female socket to the wires from the cigarette plug. However, I do not know which wire from the plug is positive or negative.
Anyone knows? Please help, thanks.
https://www.amazon.com/Bussmann-BP-H.../dp/B000GKEXK2

https://www.amazon.com/Bussmann-BP-H.../dp/B000GKEXK2
The reason that I want to tap a female cigarette socket to the existing cigarette socket plug because I just want a simple set up. Since the ashtray door cannot be closed now due to the car adapter and the usb cable, the only simplest way to solve the problem is tapping the wires so that I can hide the new female cigarette socket, car adapter and the USB cable under the glove box.
Car Mate CZ206A 15 Amp 2-Way Auxiliary Socket Adapter - Pack of 1
You might want to do a search for this on Amazon. It or something like it could be a simpler solution.


The ideal location is still splicing the wires from the cigarette lighter socket under the the ashtray at the center console.
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