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Adding aftermarket fog lights - want them on with headlights


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Not sure what your actual goal is here.    Maybe my old brain can’t follow.   
 

Here  is what I’d do to find the circuit you want.   1. Pop the hood and let truck sit for 20 mins  with ignition off and doors closed so all circuits fall asleep.  2. Probe away and take notes.   3. Turn on ignition and headlights( if that’s your plan) and probe away.  
 

Me, I’d find a switched source and tap into that.  

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Can't say I sat for 5 minutes with it.  However they never turned off no matter what switch setting the lights were on, including all off.

 

I'll try the parking lamps next.  Didn't have a chance to as I was running out of time last night.

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7 minutes ago, spartus said:

Not sure what your actual goal is here.    Maybe my old brain can’t follow.   
 

Here  is what I’d do to find the circuit you want.   1. Pop the hood and let truck sit for 20 mins  with ignition off and doors closed so all circuits fall asleep.  2. Probe away and take notes.   3. Turn on ignition and headlights( if that’s your plan) and probe away.  
 

Me, I’d find a switched source and tap into that.  

Goal is to have the fog lights come on with and stay on while the headlights are on.  Off otherwise.  Just driving around in broad daylight they should be off.

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Then use the parking lights as your signal.  They only come on with the night time headlights.   The headlights during the day also work as your DRL.  So wiring into that circuit would make the fogs on during the day too.  Don’t think you want the fogs  on during the day.  

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