The wiring to the factory fogs is inadequate in the first place and will not carry the necessary current to run anything extra without trouble to your original wiring & tiny silicone brain parts. So I'm told.
In any case, if you haven't had a wiring harness melt while driving down the road, as "some" of us have, I'd suggest remedial action is never as economical as preventive care before the tow truck/and/or the fire crew arrive. In any case, do what YOU want but I've already done enough wiring free-style to be willing to hire experts that save me from headaches.
I planned ahead when installing the custom Daniel Stern Headlight wiring harness to power the upgrade DStern headlights I settled on about 6 months ago.
I needed better headlights, ran the +80 Philips bulbs for about 6 months, and had to upgrade from those.
DStern, Hilldweller and others here provided helpful links and discussion of choices. It was obvious to upgrade more power down the wires to better bulbs, the basic need was to insure better wires to carry the juice in the first place.
So the primo DStern hellas/harness/bulb was a tic under $400, which proved to be the all-time-best return on investment I've made in any electrical mod ever.
Having the 'extra fog light leads' included at the time was only a few $ more, and I knew they would be needed, as in the PNW Outback we get a LOT of pitch black, rural, no fog lines/reflectors/etc/rain/heavy fog for considerable weeks to months of the year.
Easy to follow wiring replacement, just lay the new harness out and everything reaches where it's supposed to go.
I don't know if I can get photos that help, I'll give it a try and post if they show anything.
Read the Daniel Sterns Lighting Consultant stuff; well worth the time before you decide what to do.
get in--buckle up--hang on
"soothing agricultural implement/personal servant/Walter Mitty multidimensional access utility device conveniently travels on pavement when necessary and often keeps me warm/cool/dry/soothed as needed."