whoops, forgot to add, i had a pro wire mine, a rally wiring specialist, i suck with wirin. he's £25 per hour, but it didnt cost much to do these as mark had them already fitted. no no they dont always come on, they are controlled from the button. let me explain: to turn your STOCK rear fog light on you must have your full lights turned on, it will not come on with just the side lights turned on, it must be the main lights themselves, and u can turn the rear fog on and off with the button to the right of the steering wheel. well its the same with the front fogs on my car, only i can turn them on with just the sidelights switched on, i dont have to have the main lights on to use my fog lights. the sidelights must run on a different circuit to the mainlights, hence u can select the two indivdually, well the fog lights are spliced into the sidelight circuit to draw their power, and are controlled then using the button. trust me, if u take it to a wirin pro whoknows wot they're doin and say, wire them into my sidelights please, here's a button to wire them up to aswell, he will know wot u mean. Phil.