I recently bought a 2004 Accord EX - 4 cyl, and have noticed the headlights dimming down for a second about every 35 seconds while driving. This happens only when the AC or Defrost is on. I took it back to the dealer and they said my battery was bad and replaced it. They said the alternator was fine, it was putting out 90 amps. I believe 90 amps is normal?They also said some dimming is normal. I am still having the issue after they replaced the battery and it is annoying me to the point that I am going to go insane. I am wondering if the guy in front of me thinks I am flashing my lights at him every 35 secs. I have owned a few other cars, including a 97 accord and have never seen this issue before.Also, I notice that when the fan or a/c kick on every 35 seconds, that it seems to only affect the headlights, not my dashboard lights.

Now I have read many posts about others having a similar light dimming issues but no one has ever posted if they found a way to actually stop this from happening. If anyone that had this issue and found a solution, I would much appreciate how they did it.

 

it is normal. stop being paranoid. nothing is wrong. the extra load lowers the voltage level momentarily. it's not broke, so don't fix it.

 

It is normal. The only way to stop it would be to install a high output alternator and even then you might notice the lights dim.

 

normal.

 

You could try a "big 3" upgrade. Some have experienced success there. You would probably have to DIY that though. I doubt many dealerships woulddo it or even know what you are talking about if you asked them about it. It's not hard. You may even have fun doing it!

 

A capacitor could help.