With four lights it makes sense, two in the front and two in the back. The main light cable on the front of the controller is too short and you have to plug it in to reach it. And the wires to the lights at the back of the car are about two meters long, so they need to be spliced as well. The wire is so thin that it needs to be soldered to the extension cord you bought. There's no way to "glue" it, and you don't want to find out later that it didn't work, so solder it on.
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