headlights don't work off switch

[02YukonD]

Both

 

[El Capitan]

Check fuses first, idk if there is a relay for fogs, was your truck factory equipped with fog lights?

 

[02YukonD]

OK and yes it was factory equipped

 

[El Capitan]

if fuse and relay (if there is one still unsure) are good. Try replace foglamp switch.

 

[02YukonD]

OK thx for the advice.. I'll start at the fuse and work my way back