The running light wire and brake light wire of the taillight are respectively connected to two contacts of the taillight bulb, and the grounding wire is connected to the iron sheet of the shell. You are right. Because the two filaments of the bulb are connected with the shell of the lamp cap into a loop, the two filaments are also connected, that is, connected in parallel, and each filament is electrified without affecting the other filament, so it can be lit separately or separately.
Pay attention to buying
Check the operation of headlights, direction lights, brake lights, instrument lights and the sound of speakers one by one. If there is no abnormality, the electrical appliance is normal. In addition, you can take the car back and forth several times, feeling that it is very light as a superior car. On the contrary, some parts encounter friction and produce resistance. Also observe whether the front and rear shock absorbers and the engine leak oil and ride comfortably.