I had the mod done on my 2003 F350 that let the fogs stay on with the high beams. If I recall, isnt the brite box highs, lows, and fogs >> didnt this cause some wiring harness issues?
My brother has that mod done on his Dmax (highs,lows, and fogs!). I have driven both and here is what I have found. I have made many miles as my family owned a trucking company and I lived in a truck for 6 years doing long distance hauling so I think the info should be credible.
Driving stock with fog lights on has the eyes making a transition when changing from low <> high. One way, the light in front of the vehicle goes away on you when changing to high beams, and there is a brightening of sorts going the other way.
When the fogs stay on with highs and lows, the light in front of the vehicle remains constant, just reaching out further on highs. My eyes were relaxed with this and even with upgraded fog light bulbs, the oncoming traffic was okay with it if they were set a bit low.
Now on the Dmax with everything lit up, it was awesome when driving in areas with wildlife along the road - you could see the eyes very well. However, when going to dim, I found the reduction of all that light to be too drastic and it seemed dark to me.
I hope this helps shed some light.
On these newer trucks, cant the mod be done like on the older ones to just have the fogs stay on with highs? If not, I will be wiring them into one of my upfitters and regaining control. Will look at a diode setup (if thats the right item?) that will allow the system to remain as
built it, just push some juice to the fogs when you want them to stay on.
FYI - my 2003 was a truck with DRL's and the mod worked just fine!
