headlights dim when fans kick on - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 10 (permalink) Old 03-12-2007, 02:59 AM Thread Starter
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just wondering if anyone else has problems with the headlights dimming when the fans come on and when they are rolling the windows up/down...

What are things I can do to fix this?

I have an apexcone 6k HID kit that I havent put in yet. will this go away after I install the kit?

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post #2 of 10 (permalink) Old 03-12-2007, 08:58 AM
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Just wondering what the condition of your battery is like? Cause a lowish charged battery can have this kind of behaviour. How does your car start first thing in the morning? If it starts sluggishly then it is a sign of deterating battery or worse with electrical problem relates to the charging circuitry. Just a suggestion to check.
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post #3 of 10 (permalink) Old 03-12-2007, 02:49 PM
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I am going to go ahead and say that it is most likely a weak battery. How long has it been since you replaced it? My battery is pretty weak right now after the winter and the windows are kinda slow going up sometimes and the lights dim as well. Starting was pretty sluggish too this winter.

Next step would be a bad alternator.
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post #4 of 10 (permalink) Old 03-12-2007, 03:01 PM
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Hmm, how often is recommended for a swap for our batteries?
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post #5 of 10 (permalink) Old 03-12-2007, 07:34 PM Thread Starter
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the battery is the one that came with the car, and I have only had it a little over a year. its a 2005 I got in feb of 06 new.
What would be the best to replace it with? the car starts like normal and is not sluggish at all.

I was thinking an optima red or yellow top. anyone have the part numbers for those batteries that fit our car?

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post #6 of 10 (permalink) Old 03-13-2007, 07:32 AM
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In other words, that battery is practically brand-new, and there shouldn&#39;t be a problem with it.

Before wasting $$$ on a new battery, take it to an Autozone or Advance Auto (or any other auto parts store) and have the battery tested, just to make sure it&#39;s working properly.


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post #7 of 10 (permalink) Old 03-18-2007, 03:23 AM
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Your fan controller sensor my be going out I had to replace one

Bone stock 6s atx..... Or is it?
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post #8 of 10 (permalink) Old 03-18-2007, 05:19 AM
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i have 2003 6s and my headlights dim for a split second whenever i move my windows up/ down. i dont think its anything major. it happens on my civic as well, so i doubt it has something to do with the battery.

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post #9 of 10 (permalink) Old 03-18-2007, 09:04 AM
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This thread is another one of those that makes me say . #1, indabox does not state when this happens (i.e. idling, or when driving) so it&#39;s kind of a pointless question.

Every
car made does this to some degree, especially at idle. It&#39;s just the load hitting your elestrical system before the voltage regulator can adjust - usually taking a whole split second. It&#39;s worse at idle and can dim your lights while under the additional load because the alternator really can&#39;y sustain it&#39;s nominal output until about 1500-2000 rpm&#39;s. You&#39;ll also notice the occassional flicker while driving especially when the AC compressor kicks in because of it&#39;s very high draw as the clutch is engaged.

While you can&#39;t totally discount the battery&#39;s condition based on the lack of info given, a quick trip to your local shop, or parts store can check out everything in about 15 seconds if they have a Midtronics tester.

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post #10 of 10 (permalink) Old 03-18-2007, 10:16 AM
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Quote:
i have 2003 6s and my headlights dim for a split second whenever i move my windows up/ down. i dont think its anything major. it happens on my civic as well, so i doubt it has something to do with the battery.[/b]

+1

But 03- 04 and some 05 6s has had problems with this. In the early stages headlights dim and later the fan gets louder and fails to turn off.

http://forum.mazda6club.com/index.php?show...=headlights+dim
http://forum.mazda6club.com/index.php?show...;hl=fan+control
http://forum.mazda6tech.com/viewtopic.php?t=9

Bone stock 6s atx..... Or is it?
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