Thank you for all this information everyone!
Just wanted to share my experience with this mod:
Step 1: I did the diode thing to make FOG and High beams on at same time (which was super easy and works like a champ) Thanks again to the original poster!
Because I also installed High powered xhp 70 CREE lights into my high beam and low beam housings I was having the typical DRL issues (headlight would turn off when put into drive) this also occurred randomly after installing canbus thingy as well (my guess is that these mechanisms are not 100 percent reliable). so I decided to make a more reliable setup, one that wouldn't have a possibility of turning my headlights off randomly with no way of getting them back on while I am already driving.
Step 2: I re-routed my fog wires to the low beam housing
Step 3: I re-routed my low beam wires to the fog light housing
so my DRL are now my fogs (just aimed them up a little bit from where they are set from the factory for increased visibility during the day)
to turn on my low beams I just hit the fog button on the dash (results in lows and fogs being on)
flip the high beam switch on - and all 3 lights are on regardless if the lows were on before the flip or not.
flip the high beams off -results in the lights reverting back to whatever was on before the high beams were switched on 1. lows plus fogs or 2. just fogs ( now my DRL)
Sorry if this has already all been said have to admit I didn't read all 50 pages.
This was done on a Canadian 2015 Silverado LT