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minor tiny dimming lights

 
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  #1 (permalink)  
Old 27 Jul 2018, 02:08 pm
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Default minor tiny dimming lights

I have noticed while driving home at night on the highway, all the lights in my PT slightly dim. You almost don't notice it, but I can just barely make out that the lights flicker just slightly. This is not a completely shutoff and turn on, it just dims slightly then comes back.
I noticed it on my 04 and now on my DC2, Just a slight tiny bit of a dim, then comes back, then barely dims. It doesnt happen all the time, usually after the car warms up, but I have seen it before it does get cold. I know it's not any load on the system, as my radio is usually off, and I have replaced all but the headlights with LEDs, so I shouldn't be putting too much of a load.

Wondering if anyone else has noticed this, and if they know of any fixes. I'm thinking either a weak battery/alternator? I'm not sure, but It acts like how lights dim slightly when bass hits in a high end audio system, but again, my radio is off. So i'm not sure. I think installing a large capacitor would fix the issue, as i know its a drop i voltage, but I'd rather fix the root cause.
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Old 27 Jul 2018, 02:34 pm
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Cool Re: minor tiny dimming lights

check all of the grounds...
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Old 27 Jul 2018, 06:22 pm
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Default Re: minor tiny dimming lights

It could be the voltage regulator which is in the PCM. It is not in the alternator.

The alternator could be putting out too little power.

The battery may be bad

The multi function switch may have the dimmer set low - slide it back up.


- You said this happens on the freeway. Is it only while cruising at a high speed where the lights start to dim? If so, I would think it is the alternator or the voltage regulator in the pcm (not sure how it works, I've never heard of the voltage regulator going bad) I am thinking the alternator is not providing enough power. (wild guess - I have never experienced this issue)
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Old 28 Jul 2018, 02:56 am
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Default Re: minor tiny dimming lights

2006 NA -- After driving for 5 minutes at night I come to a stop sign. The headlights will dim slightly and return to 'normal'. Very slight change, as if the charging voltage went from 14v to 13.5v to 14v. for a split second. It's been doing this for years, I'm not concerned. ----- The hi-speed radiator fan is a high current device. Another possibility for intermittent current draw.
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Old 28 Jul 2018, 07:55 am
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Default Re: minor tiny dimming lights

Is the alternator belt tight?
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Old 28 Jul 2018, 09:49 am
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Default Re: minor tiny dimming lights

Quote:
Originally Posted by pt06 View Post
2006 NA -- After driving for 5 minutes at night I come to a stop sign. The headlights will dim slightly and return to 'normal'. Very slight change, as if the charging voltage went from 14v to 13.5v to 14v. for a split second. It's been doing this for years, I'm not concerned. ----- The hi-speed radiator fan is a high current device. Another possibility for intermittent current draw.
Mine used to do that, too, until I replaced the TIPM and it hasn't done it since.
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Old 29 Jul 2018, 02:16 am
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Default Re: minor tiny dimming lights

I had this same problem.

I just installed a resistor in series with the battery temperature sensor, this determines what voltage and current output the alternator delivers to the electrical system. Over time the battery temp sensor breaks down and give inaccurate information to the PCM. Now, the voltage is always at least 14 to 14.4 volts
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Old 29 Jul 2018, 08:43 am
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Default Re: minor tiny dimming lights

Quote:
Originally Posted by _PTGT03 View Post
I had this same problem.

I just installed a resistor in series with the battery temperature sensor, this determines what voltage and current output the alternator delivers to the electrical system. Over time the battery temp sensor breaks down and give inaccurate information to the PCM. Now, the voltage is always at least 14 to 14.4 volts
The Gen2 doesn't have the battery temp sensor, like the Gen1 does.
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Old 30 Jul 2018, 07:17 am
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Default Re: minor tiny dimming lights

Isn't he talking about his 03 Dream Crusier, Rick? Now I'm confused.
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Old 30 Jul 2018, 07:50 am
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Default Re: minor tiny dimming lights

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Originally Posted by chuzz View Post
Isn't he talking about his 03 Dream Crusier, Rick? Now I'm confused.
I was commenting about the post from pt06, he has a Gen2 the same year as mine and his had the same "quirk" as mine.
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