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Open Roads Forum  >  Tow Vehicles

 > Fog lights on w/ High Beams, New GM trucks

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Grit dog

Black Diamond, WA

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Posted: 03/05/21 11:58am Link  |  Quote  |  Print  |  Notify Moderator

I question how full manual control of the fogs is possible with the Boostauto or DIY diode mod.
IIRC, Boostauto doesn't claim the ability to turn off the fogs when high beams are activated and it doesn't make sense that it would be possible. Last 2 trucks I did, the fogs were automaticlaly on with the high beams. Just like this one.
Regardless, if you have your brights on, it's for more light and the more the better!


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Slownsy

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Posted: 03/05/21 06:08pm Link  |  Quote  |  Print  |  Notify Moderator

Yes sir and in the land of OZ it is illegal to drive with fog lights on unless there is actually foggy conditions.
Frank.


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StirCrazy

Kamloops, BC, Canada

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Posted: 03/05/21 07:50pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Works just like on the last couple gen trucks.
New 2020 Silverado

Will see how much it helps.
Last Chebby, 2016 model, it was night and day difference (pun intended, lol).
Well not quite, but the OE fog/driving lights did a nice job of keeping the foreground lit when high beams were on.

Google it if interested. Hardest part is getting the diode wire into the back of the plug receptacle without kinking the wire. Small pair of needle nose pliers and making a "Z" in each diode lead helps.

They make "kits" which consist of 2 scotch locks, and a diode with some shrink tubing over it for $20. I like the cheap method, $1.99 for a 3 pack, A. because I'm cheap and B. No wiring modifications, no cut insulation. Completely removable and untraceable should there ever be an electrical issue (not caused by this).

Highly reccomended simple little mod.

And Karens, please don't bother with the "its against some rule" bs.


if you would have bought the ford, you would just need to get free software conect to the computer and turn that option on. I have that, as well as changed how long my blinkers flash and several other features actavted.

weird you cant just do that for the GMC also.

Steve


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01tundra

Middle, TN

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Posted: 03/06/21 08:50am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

I question how full manual control of the fogs is possible with the Boostauto or DIY diode mod.
IIRC, Boostauto doesn't claim the ability to turn off the fogs when high beams are activated and it doesn't make sense that it would be possible. Last 2 trucks I did, the fogs were automaticlaly on with the high beams. Just like this one.
Regardless, if you have your brights on, it's for more light and the more the better!


I haven't really given it much thought, but I can confirm that the Boostauto kit does indeed allow you to turn the fogs on/off with high beams on via the factory fog light switch.


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BenK

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Posted: 03/06/21 09:27am Link  |  Quote  |  Print  |  Notify Moderator

My point being that folks driving fast enough to need high beams and have fog's on at the same time might be distracted subconsciously by stuff lit up to close to do anything about at those speeds...and try to do something that might cause an accident

Thought PSA, but that got lost to most here...


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Grit dog

Black Diamond, WA

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Posted: 03/06/21 10:00am Link  |  Quote  |  Print  |  Notify Moderator

BenK wrote:

My point being that folks driving fast enough to need high beams and have fog's on at the same time might be distracted subconsciously by stuff lit up to close to do anything about at those speeds...and try to do something that might cause an accident

Thought PSA, but that got lost to most here...


Nope, not a PSA but thanks for playing.
Driving in the dark anywhere where there are critters that jump out at you randomly, having more light up close and a wider beam lighting the shoulders/ditches is not subconscious distraction, it’s self preservation of your vehicle.

Grit dog

Black Diamond, WA

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Posted: 03/06/21 10:02am Link  |  Quote  |  Print  |  Notify Moderator

One might think, one topic that wouldn’t get resistance on a forum made up mostly of senior citizens ( generally eyesight and night vision degrades with age) is better vehicle lighting that DOESNT affect other drivers.
But I should have known better.....

ktmrfs

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Posted: 03/06/21 11:03am Link  |  Quote  |  Print  |  Notify Moderator

01tundra wrote:

Grit dog wrote:

I question how full manual control of the fogs is possible with the Boostauto or DIY diode mod.
IIRC, Boostauto doesn't claim the ability to turn off the fogs when high beams are activated and it doesn't make sense that it would be possible. Last 2 trucks I did, the fogs were automaticlaly on with the high beams. Just like this one.
Regardless, if you have your brights on, it's for more light and the more the better!


I haven't really given it much thought, but I can confirm that the Boostauto kit does indeed allow you to turn the fogs on/off with high beams on via the factory fog light switch.


range of control of the fog lights on/off with high beam on may depend on the year of the truck.


On my 2015.5 GMC 2500HD denali the diode mod including the boost auto creates a logic OR function, not a logic AND function. Fog lights on if the fog light switch is on OR if the high beams are on. I have the full set of truck wiring schematics for the upfitters and the BCM control for the lights is done via logic states, not relays etc. and the boost auto (and as far as I could determine the ONLY way) to do the fog light control with high beam via logic functions basically "tricks" the BCM to think the fog light switch is on and the high beams are off.

Other years may have different logic for the BCM and may allow the fog light switch to turn the fog lights off with the high beams on with the diode mod installed.

* This post was edited 03/06/21 12:23pm by ktmrfs *


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StirCrazy

Kamloops, BC, Canada

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Posted: 03/06/21 07:12pm Link  |  Quote  |  Print  |  Notify Moderator

BenK wrote:

My point being that folks driving fast enough to need high beams and have fog's on at the same time might be distracted subconsciously by stuff lit up to close to do anything about at those speeds...and try to do something that might cause an accident

Thought PSA, but that got lost to most here...


I use it in deer or moose country, especialy on secondary roads. when i just have high beams on there ditch area is not light up as good as it is with low beams, but having the driving lights on this is fixed which gives you a chance to see the little buggers before they jump out of the trees right infront of you.

Steve

rjstractor

Maple Valley, WA

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Posted: 03/06/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

I've never understood why foglights need to shut off when high beams are on, if someone is driving at you with their high beams on, foglights aren't going to make the glare any worse. With my VW and my Harley it's just a programming change.

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