The tail light line of the cart is connected as follows: 1. Make sure that the wires at the back of the harness are not short-circuited, especially the ground wire. First, connect the ground wire of one side (for example, the right side) of the taillight with the ground wire in the harness (this wire in the car is black, which can also be measured by a multimeter); 2. Then turn on the key and turn the turn signal switch to the right. Use the test lamp or the rear taillight to find the line that can make the light bulb shine (the turn signal is flashing), and then use the found line to touch the live wire in the rear taillight respectively. When the right rear turn signal is on, connect this line and wrap it. 3. Turn off the turn signal and turn on the small light in the same way. Connect and wrap the small lamp. Find out the brake lights and backup lights in turn; If there is a rear fog lamp, it is necessary to connect the rear fog lamp; 4. After that, it should be noted that when the small lamp is turned on, the fog lamp will not light up until the rear fog lamp switch is turned on. Similarly, you can connect the left light at the same time, but to connect the left turn signal, you need to turn the turn signal switch to the left.