Headlight Question

[Col]

You have H4 headlight bulbs so they work on dipped OR main as both filaments are in the one bulb and it would overheat with both filaments on at the same time.
If you had H7's or H1's they normally both come on with main beam as they are seperate bulbs (I suspect this is the case with your other cars)

It is an offence to use foglights if visibility is over 100mtrs. as they can dazzle oncoming traffic and are likely to get you a £30 fixed penalty.
You would be better to fit supplimental spotlights, or try adjusting lights downwards slightly.

http://www.highwaycodeuk.co.uk/driving-i...w-226.html
http://www.pistonheads.com/gassing/topic.asp?t=945251&i=20
http://www.swiftcover.com/about/press/fog-lights/

Indeed, and I wish the police would crack down on misuse of fog lights, about 1 in every 6 vehicles round these parts seem to drive about with fog lights on, I am sure some thing they are bling jewellery - bloody annoying.
You will see in my OP that i suggested wiring the fogs to come on only with "Main Beam"  so effectively they would no longer be fog lights but supplementary spotlights

Fog lights are fog lights due to their position and beam pattern.
If you wired them up as stated you could fail an MOT for incorrect beam pattern  (section1.8 MOT testers manual) but testers seem to differ on this as they are not "Prescribed lights".
Properly adjusted fog lights only light up a few feet in front as they are designed to *shine* under fog and light up Kerb and centreline for a very short distance, hence they have no real range. This is to stop the light reflecting back at you from the fog. This really is to close to the front of the car to make any real difference

Check out http://www.legislation.gov.uk/uksi/1989/...on/20/made Check items 2 & 6 and follow the schedules and you will see spot & fogs are very different in use, position, and beam pattern.