I have a 89 honda crx and was looking behind the fuses tracking a wire and followed it to a car intena booster. I have no idea what a car intena booster is but it works. Has three wires one goes to the intena the other to the radio but the one I tracked goes to nothing. It's a red wire and thought it went to a switch but the switch has nothing on it either

!!! If anyone knows where the red wire goes or what the switch is for please tell me.
The switch is located to the right of the stering wheel. Please help.