2020 2500HD Roof Light Provisions

[onetactical]

The snow plow prep package states it has roof light provisions. How would one get a wire to the roof to mount  temporary lights warning lights for plowing?

 

Also, if I remember correctly my 2015 GMC Sierra 2500HD had a switch in the overhead console for the warning lights? I don't see anywhere to mount a "factory" switch without adding the aux switch panel?

[Major Tom]

Take a look here:

 

[unit]

The snow plow prep package already has the wire above the roof panel.  You would need to drill your own hole in the roof and fish the wire through the hole.  Switches go in the dash to the left of the steering wheel. GM makes a new dash panel with the hole in it for the switches. The link below has everything you need to know.