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Edgingage

Dimmed fog lights operating voltage?

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Hi folks, 2011 SEL here:

 

We all know that, during daytime, with lights knob selected to automatic, the headlights AND signature/vertical/"fog" lights dim while driving.  I've heard/read some comments stating the signature "fog" lights go to 50% and other comments stating they go to 70%, but it's not always clear to me if they're referring to luminosity or actual voltage.  Does anyone know what's the actual voltage these lights dim at?

 

In other words, and specifically, I would like to know what's the minimum operating voltage the signature/vertical/"fog" lights get when operating in dimmed mode.

 

Your info is very welcome and greatly appreciated in advance.

Edited by Edgingage

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headlights should not dim while driving. check to see what voltage is present at the connectors. if bulbs are old, they may be failing as well.

 

do you have halogen or HID?

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Znow, thanks for your reply, I appreciate it.

I realized my OP above was not clear; I just corrected the wording in my OP above.

My question (as stated in the tittle) is regarding the power (voltage) getting to the vertical signature "fog" lights when the car is running during daytime as these lights function also as DRL then, but at reduced luminosity.

 

Do you (or anyone else) know what voltage is powering the vertical signature "fog" lights when they're dimmed (while the car is running)?  Luminosity is reduced; my understanding is that that's because the voltage getting to them is reduced.  My question, what I'd like to know is: What's the voltage getting to the "fog" lights when the voltage is lowered during DRL and therefore their ("fog" lights) luminosity is diminished as a result of a lower voltage getting to them?

 

Thanks in advance.

Edited by Edgingage

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Don't quote me on this, but I think I read somewhere long ago that they still operated at 100%, but at a reduced duty cycle. 70% on, 30% off or something like that. Controlled by a FET in the SJB.

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Enigma, thank you very much for your reply.

 

That's why I think I also read but I wasn't sure if that's regarding luminosity.  So then I could interpret it as that the signature "fog" lights will operate dimmed at 12V x 70% = at 8.4V?  Is my interpretation correct?

 

Please let me know.

 

Thanks in advance.

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