Adding aftermarket fog lights - want them on with headlights

[spartus]

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.  

[AJMBLAZER]

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.

[AJMBLAZER]

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.

[spartus]

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.  

[AJMBLAZER]

Nope, I do not.

 

I'll give that a shot later.  Thanks!

[AJMBLAZER]

Cross your fingers. I tapped to fuse 42 and seems to be working good. 

[AJMBLAZER]

Been running it for a week and so far, so good. Love the difference in light output. 

[spartus]

Glad you got it working to your satisfaction.  It’s always nice when a new mod works out.

[Arbedre]

On 3/6/2022 at 6:19 PM, spartus said:

Glad you got it working to your satisfaction.  It’s always nice when a new mod works out.

Hi, I know this is an old post. I installed aftermarket fog lights on my 2019 Custom. They work fine, but the right tail light is not working properly. I mean, when I press the open button on the remote, it turns on only the left one.

[AJMBLAZER]

Where'd you get power from?  Something's clearly sending power to the tail light when you do that.

[Arbedre]

1 hour ago, AJMBLAZER said:

Where'd you get power from?  Something's clearly sending power to the tail light when you do that.

From the battery positive post. Red to positive, black to negative and white to tap fuse # 42.

[AJMBLAZER]

I'd check your wiring.  Somewhere you're energizing the taillight with that switch

[Arbedre]

Thank you, will do

[Kev2lee]

On 2/13/2022 at 6:35 PM, GETGONE said:

 

Incorrect. You DO NOT need the OEM switch and BCM flash to use the Boost Auto diode. I didn't want to pay the dealer $160 to flash the BCM in addition to the $230 I already paid for factory fog kit. I actually had a Fleece auto diode kit which is much nicer than the Boost part. I connected the input signal from the parking lights to the the fog light trigger wire under the dash at the BCM connector and they come on with the parking lights. They stay on with the high beams since the parking lights are always on when the lights are on.

 

With the aftermarket kit and the relay, you would wire the relay for power and ground and the signal wire would be to a tap on the headlight fuse under hood if you don't want to run a wire inside.

Apologies I’m late to the game here.

GETGONE can you shoot me some pointers?

I have the OEM kit installed already as well and not willing to pay $200 to have the CBM flashed either. 
I want my set up like yours, tapped into the parking lights.

since I have everything installed, would I just unplug the fog light trigger wire from the Brown box on the CBM and tap it to the parking lights wire? The. What about the wire going to the fuse box under the hood?

im lost, any info would help!

[GETGONE]

Yeah, I pulled the brown wire from where GM instructions tell you to put it and I used a T tap to tap the parking light wire under the dash. That's the only thing you need to do. Leave everything else alone as the GM instructions state. The BCM is what needs an output where GM has you put it on the connector and the input is the foglight switch that comes with the kit. I never did change back to the original headlight switch. I'd have to look to see what wire and connector the parking light is if you don't already know.