When you hit the gas lights get dimmer?

This is a common problem with older vehicles, and it's usually caused by a faulty voltage regulator. The voltage regulator is responsible for controlling the amount of voltage that goes to the lights, and when it fails, the lights can flicker or dim when the gas pedal is pressed. This is because the alternator is producing more power when the gas pedal is pressed, and the voltage regulator is unable to control the voltage properly.