All radio-controlled cars require a radio transmitter, receiver and servos to operate. These devices are what allow you to control the vehicle. A typical Futaba system is made up of two servos that need to be connected to the receiver in order to work.
Connect the steering servo to receiver Channel 1. Typically, the servo connector is keyed to prevent inserting it incorrectly, but always check that the polarity is correct.
Connect the throttle servo to receiver Channel 2. Check to ensure that the polarity is correct.
Connect the power connector to the receiver ensuring the polarity is correct. The power connection might be the four AA-battery power pack or the BEC connection from the main battery pack depending on which method you use.
Place the vehicle on a raised object so all four wheels are off the ground. Raise the antenna on the transmitter and turn on the transmitter, then turn on the receiver.
Test that the steering servo is working correctly by turning the steering wheel on the transmitter and ensuring the wheels on your vehicle turn in the correct direction. If the wheels turn in the opposite direction, reverse the steering by switching the Channel 1 reverse switch on the transmitter.
Test that the throttle servo is working correctly by depressing the throttle trigger on the transmitter and ensuring the wheels on your vehicle spin in the correct direction. If the forward and reverse are backward, reverse the throttle by switching the Channel 2 reverse switch on the transmitter.
Adjust the Channel 1 trim switch on the transmitter to centre the wheels on the vehicle. The wheels should be straight when no input is applied to the transmitter. Adjust the Channel 2 trim switch on the transmitter to set at which point forward/reverse is activated.
Always double-check the polarity of all connections. Incorrectly installed connections can damage the receiver. You cannot reverse a servo's direction by reversing the position of the servo connection.