1> Please check the Voltage of car radio: DC 12V.
2> When you test this car radio,you can combine the red and yellow wires and connect them to the positive side of the power supply.Black line to negative power supply.
3> Replace the same type of insurance to test the car radio.
Note: Please msut use our power cables to connect our car radio, it is not possible to insert the original car plug directly into our machine.