Didn't say that mate. It would be stupid to use a on off switch in a factory car would it? The guy asked if it has to be. Awnser is yes and no. They use relays on fog light these days. But it wasnt always like this was it? So yes it is better to use a relay cos its std like this. No reason to remove it. Then again if you don't have one in a cross car or something like that. A switch can be used. So i didnt say don't use the relay cos a switch is better. Read before you post something