2006 Honda Accord lights dim when AC kicks on - Drive Accord Honda Forums
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post #1 of 24 Old 04-18-2017, 04:05 PM Thread Starter
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2006 Honda Accord lights dim when AC kicks on

I have a 2006 Honda Accord 2.4 liter engine, Every time my ac compressor kicks on the engine bogs down, lights dim. I do not have any check engine lights on or code thrown. I have read about the ELD going bad but if its not throwing a code could it still be bad? Any suggestion or ideas on how to fix it. Or what to check next would help.

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post #2 of 24 Old 04-18-2017, 04:26 PM
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Originally Posted by scrivy89 View Post
I have a 2006 Honda Accord 2.4 liter engine, Every time my ac compressor kicks on the engine bogs down, lights dim. I do not have any check engine lights on or code thrown. I have read about the ELD going bad but if its not throwing a code could it still be bad? Any suggestion or ideas on how to fix it. Or what to check next would help.
Honda vehicles tend to flicker when the car is under heavy electrical load like that. It's a "feature".

Can you post a video of it?

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post #3 of 24 Old 04-18-2017, 04:43 PM Thread Starter
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I can tomorrow at work currently
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post #4 of 24 Old 04-18-2017, 04:54 PM
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post #5 of 24 Old 04-18-2017, 05:16 PM Thread Starter
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There has to be a way to fix it. I have a jeep wrangler and threw that battery over in the accord ( because it was bigger) and it still does it...Can I unplug the ELD? to see if that is causing my problems
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post #6 of 24 Old 04-19-2017, 05:36 AM
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Did this just start? Or has it always done this. In general when the AC compressor comes on both fans also come on and at idle you notice this behavior. The engine idle speed should stay the same as that is was the Idle air control is there. Put a voltage meter at the battery and see what the readings are. The ELD should put the alternator in high mode when the AC draws current, but again at idle there is not a lot of extra AMPs coming out of the alternator.

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post #7 of 24 Old 04-19-2017, 06:04 AM
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Lots of cars do that, not just Hondas. It's normal. Ever have the lights in your house dim when the vacuum cleaner was turned on? I believe it's the same principle...I don't think a bigger battery will "fix" it.

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post #8 of 24 Old 04-19-2017, 06:14 AM
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Get a high output alternator or install capacitors. The capacitors will absorb the dip. The problem is the delay in the voltage regulator ramping up the voltage when you turn up the accessories.

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post #9 of 24 Old 04-19-2017, 06:20 AM
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Quote:
Originally Posted by t-rd View Post
Get a high output alternator or install capacitors. The capacitors will absorb the dip. The problem is the delay in the voltage regulator ramping up the voltage when you turn up the accessories.
Is the capacitors an easy install? Has anyone here done it?

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post #10 of 24 Old 04-19-2017, 06:34 AM
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Originally Posted by chris918 View Post
Is the capacitors an easy install? Has anyone here done it?
Not sure if anyone here has done it but that's what capacitors are for. Quality stereo systems use capacitors for that moment when big bass is asked for. The speakers I put in my accord have a small capacitor sitting in them and I'm guessing that's what they're for. They give pretty good bass sound being driven by the weak arz stock Honda radio.

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post #11 of 24 Old 04-19-2017, 07:46 AM
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You would need a large bank of capacitors to handle more than a very short (less than 1 sec) voltage drop of 1 or 2 volts. Let's say you need 25amps for 1 second and it needs to be 2 volts.

A good approximate formula is

C=I * (Delta T) / (Delta V)

C = 25 * 1/2
12.5 Farads Cap

Thats a big cap.

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post #12 of 24 Old 04-19-2017, 08:19 AM
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Quote:
Originally Posted by greg1c View Post
You would need a large bank of capacitors to handle more than a very short (less than 1 sec) voltage drop of 1 or 2 volts. Let's say you need 25amps for 1 second and it needs to be 2 volts.

A good approximate formula is

C=I * (Delta T) / (Delta V)

C = 25 * 1/2
12.5 Farads Cap

Thats a big cap.
Isn't a 1-farad capacitor like the size of a soda can? I've seen some big ones in arcade cabinets but didn't know what capacity they had (I'm not good at that there electrical stuff). Real easy way to end your existence is to touch a capacitor in an arcade monitor

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post #13 of 24 Old 04-19-2017, 08:27 AM
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I have installed a grounding kit before with a small bank of capacitors on my V6. But on the V6, you hardly notice the dip. If you really want to "fix this" on the I4, then install capacitors like for an audio application which store energy for situations like that, IF it really bugs you that much.

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post #14 of 24 Old 04-19-2017, 09:17 AM
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This is caused by multiple electrical loads being added to the system all at the same time that the AC compressor is also temporarily reducing the idle speed, and therefore the alternator output. When the AC kicks on, there are up to three loads being turned on simultaneously, all with a higher in-rush / startup current.
  1. Compressor clutch solenoid
  2. Radiator fan
  3. AC fan

If it really bothers you, you could add time delay relays in series with the signals to turn on the fans so that the starting current of each motor is separated. It looks like something as simple as these $20 relays on Amazon.com would do the trick. I never thought about it before this thread, but I really like this idea.

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post #15 of 24 Old 04-19-2017, 10:18 AM
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You guys must be incredibly bored to spend the time and money solving issues that really aren't issues.

It happens to all cars, live with it. It's not affecting you or the car or the way it drives, leave well enough alone.



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