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Turn signals light up with headlights

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Old Nov 22, 2016
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Turn signals light up with headlights

Hi all,

I just replaced the headlights in my wife's civic. When testing them, I noticed that the turn signals are lit up whenever the headlights are on (both sides). They still blink if used.

1) Is this normal behavior for a 2004 Civic?

2) If not, this is probably a crossed wire somewhere? Any tips on where I could look for that?

Any ideas will be helpful. Thank you.

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Old Nov 22, 2016
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Re: Turn signals light up with headlights

I believe this is normal. The bulb used for the turn signal and parking light is a dual filament bulb.
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Old Nov 22, 2016
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Re: Turn signals light up with headlights

Originally Posted by NDNV
I believe this is normal. The bulb used for the turn signal and parking light is a dual filament bulb.
Thank you!
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Old Nov 22, 2016
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Re: Turn signals light up with headlights

The park light is lit up, not turn signal. Turn signal is much brighter than a park light.
Same bulb, two filaments, two brightnesses.
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Old Nov 23, 2016
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Re: Turn signals light up with headlights

Poor grounds could cause such an issue. 'Lectricity always seeks a path to ground...even if it is through another light filament.
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