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Thread: causes of lights dimming...

  1. #11
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    Quote Originally Posted by soundman98 View Post
    how do your battery terminals look? if they have any corrosion, the car can do wierd things. also, do you have the vent selector knob on defrost? this can also cause it if the a/c pump is drawing a lot

    i really don't think that it has to do with the audio/computer system at all though-- audio stuff really only draws heavy when you have it turned up. but to prove it, you can pull the fuse(s) for all your carputer/amps, and the problem should still be there.
    My old battery was *badly* corroded. Some of the corrosion likely travelled up the battery cable a bit. Could that be the cause?
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  2. #12
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    If its that intermittant it doesn't sound like a current problem.

    Shake the car a little bit and see if that causes the problem...or do a few passes over a speedbump.

  3. #13
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    Quote Originally Posted by justchat_1 View Post
    If its that intermittant it doesn't sound like a current problem.

    Shake the car a little bit and see if that causes the problem...or do a few passes over a speedbump.
    It'll happen when I'm parked, so I don't think it's something loose. Also, speedbumps don't trigger it.
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  4. #14
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    Our Honda Pilot has some kind of system that kicks on and off even at idle. I used to think it was air conditioning but now it's winter and it will still do it. It's related to the climate control system, almost like it's an air exchanger so it works either hot or cold.

    Anyhow, when it does pop on, you can tell the engine is under load, then it will pop off. Cycles like that all the time.

    Try with the heater and all electrical OFF (as much as you can) including seat heaters, fan, even put the climate control at cold. See if it does it then. At least that would eliminate one variable.
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  5. #15
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    Quote Originally Posted by Bugbyte View Post
    Our Honda Pilot has some kind of system that kicks on and off even at idle. I used to think it was air conditioning but now it's winter and it will still do it.
    With the defroster on i'm guessing? cause an a/c compressor is the only thing that should be causing varying engine load at idle.

    @kev:
    see if you can can try keeping the revs up...maybe a highway drive or something...and see if it still occurs (like 2k1Toaster said).

  6. #16
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    Pick up a cheap ammeter, hook it up to your accessories and keep it on your dash while you drive for a few days. Yes, it will look messy for a few days, but it could definitely help you figure out if your stuff is randomly pulling a ton of current.
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  7. #17
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    In the Impala right?

    ...time to pull out the multimeter...

    I have a love/hate relationship with fuses. The power window fuse popped in my truck, I looked at all of my fuses (in the cab and under the hood) and everything seemed fine. It wasn't until I pulled it out that I saw the separation. What was funny about the whole thing was three times the windows worked while the fuse was blown... Now this could have been for a number of reasons that Im not going to speculate, I'm just glad I had a witness in the truck so I didnt think i was going crazy or having a flashback...

    If it was a draw issue when you cranked up the load (under idle engine speeds) the lesser drawing elements such as lights and clock should start failing right? My point if its dimming lights now under "light" load then what does it do under "heavy" load?

    I would disconnect the everything aftermarket and start from there. If the problem is gone then start adding one component at a time until the problem surfaces. Then remove everything but the last component installed that triggered the problem, If the problem disappears then start adding components again till it comes back. Really there isn't a good way to check everything other than a multimeter... even then your still fishing for the problem...

    Overall, I get the feeling its a weak battery and/or weak alternator. Hell it could even be a bad engine ground...

    Oh a side note, just from my experience, that will never happen again... pop the hood if your just sitting there idling and revving the engine. Smooth Blew Up a radiator when I was 16 trying to figure out why my lights were dimming.
    Quote Originally Posted by menudude View Post
    thank you all for your help minus the useless post by sjlucky...

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