Does anybody know if its a requirement to have the fog lights switched only when the headlights are on, as in production cars, or can i just wire as normal using iluminated switch.

It used to be that they could only come on with dipped beam but now most cars seem to have them wired to come on with sidelights and main as well, best to check with your SVA station for their view on this. Just power them from the relevant relay through an illuminated switch if that's what you are asking.

I am sure on the Sierra wiring the supply for the fog light comes from the side lights.
So to be safe just do the same.

Just read through the SVA manual, the only reference to Fog lights, is that they should have a "Tell tale" indicator lamp, that must be seen from the steering position. Must be square to the rear of the vehicle, verticaly and horizontaly. It doesn't actualy mention about how they should opperate. Not much help, but thats the manual. Regards Ray.

Thanks for the replys, I read the manual and, as as noted there is no refrence to working with sidelights etc.
But i think to be safe i will wire through the side light relay.

Cheers

... if SAV manual deson't specify, it may be an MOT thing; dunno but I thought it was switched when side lamps are on? (it's strange how you never notice these things ... )

Fog lights as opposed to spot or driving lamps must be able to come on without the headlights. Fog lights are normally placed low down and set to shine on the road a short way in front of the car so that the driver is not dazzled by the glare from the fog. It is illegal to use them if visibility is less than 100 metres and the same applies with the high intensity rear light.

I think the minimum headlamp height rule applies to auxilliary driving lights and I could never understand how Peugeot got away with under the bumper lights on the 205gti that illuminated with main beam. Manufacturers seem to be above the law. Would we get away with driving with 3 normal tyres and one of 135 section?

John