2004 Honda Civic Q&A
2004 Honda Civic Question: Headlights dim when turn on cabin fan or use power windows.
I just replaced the battery in my wife's car. I've never noticed this before until now, although I don't drive her car very much so I don't know if this happened with the old battery. When I use either the power windows or turn on the cabin fan, the headlights get a little dimmer. I'm assuming that isn't normal behavior. Any guess as to what the problem could be? - geoff18
It may be normal to dim a slight little bit. I would put a volt meter across the battery a fully charged batter should be 12.6 volts. Turn on the ignition switch to the on but not run position do you see an icon on the instrument panel representing a battery, if you do not see this battery icon the alternator is not seeing power to allow it to charge. Start the engine does the battery icon go out. A more complex but good diagnostic test is checking "voltage drop" on the battery ground and power cables. You can find a video on how to do a voltage drop test on youtube. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly. If the alternator is not charging correctly or sufficiently it will cause headlamps to dim when other electrical loads are turned on. - patrick mannion