Ground Wire: This wire connects the radio to the ground, which provides a reference for the radio waves. It is usually made of copper or aluminum and is typically thicker than the antenna wire.
Power Wire: This wire connects the radio to the power source, which provides the electricity needed to operate the radio. It is usually made of copper or aluminum and is typically thicker than the antenna and ground wires.
Speaker Wire: This wire connects the radio to the speakers, which produce the sound. It is usually made of copper or aluminum and is typically thicker than the antenna and ground wires.
Microphone Wire: This wire will only exist on AM/FM and CB radios if they have the ability to have external microphones. For a CB external microphones can only be used on AM. When they were installed in vehicles or homes the original equipment microphone would go in that spot. This wire connects the microphones to the radio that are picking up your voice to transmit across the airwaves (transmit radio frequency signals). When they were installed in vehicles or homes the original equipment microphone would go in that spot. It is usually made of copper or aluminum and is typically thicker than the antenna and ground wires.
Some additional radio wires that may be present include:
Remote Control Wire: This wire connects the radio to the remote control, which allows the user to control the radio from a distance.
AUX Wire: This wire connects the radio to an external audio source, such as an MP3 player or CD player.
USB Wire: This wire connects the radio to a computer, which allows the user to transfer data between the two devices.