I recently purchased an aftermarket fog lamp kit for my 2015 F350XL.
It of course came with a wiring harness but no instructions (I can't read Chinese anyway).
I intend to wire them to my #1 upfitter switch.
My question is, do I cut the wires coming from the lights and eliminate the supplied relay and fusible link?
I've attached a picture.
Thanks for all of your input!

 

I installed one of these light kits in my 2015 SD. I used the relay included with the kit, but I don't think you really need to.

 

The upfitter switch turns on a relay already so no, this relay is not needed, same with the fuse. Just make sure you use the upfitter switch ratted for the current you need

 

You don't need the relay or the fuse. As AZlugz said just make sure you have the right amperage, especially if you take fuse out.