The answer to 'carbon monoxide detector dimming lights' is that a carbon monoxide (CO) detector can sometimes cause lights to dim or flicker when it is activated. This is because the CO detector is drawing power from the electrical system, which can temporarily reduce the voltage and cause the lights to dim.
This is a common occurrence and is not necessarily a sign of a larger electrical problem. The CO detector is designed to detect dangerous levels of carbon monoxide and will draw more power when it is activated, which can lead to the lights dimming. As long as the lights return to normal brightness after a short period, this is typically not a cause for concern.