Some people (on a V8) modify the front fog switch wiring to operate the rear fogs. I prefer to tamper with the original wiring as little as possible, so I fit a new switch. (V6 cars do not have a fog switch anyway so you have no choice but to fit a new one in that instance.)
You need an illuminated switch. It should be visible from the driving seat ideally in order to pass a test. I use an after market one and site it near the regular light switch.
Chances are, if your light has an E mark, your VOSA tester will not get too involved seeing if it complies to some obscure Brussels rule – he will merely assume it does because it has an E mark. That said, he reserves the right to check something himself if he is not happy with it. My experience suggests they look for an E mark, and when they find it, they say, “Ahh, thats OK then”.
So what do you do with your old ones? First thing is don’t be a clown and assume that because you paid £130 for your new Euro ones that your old “genuine USA tail lights” are worth £100 of anyones money – they are not!
The inner unit is the fog lamp, the outer is side/tail the centre is the indicator and the reverse is below it. All the lights you need are in this one unit, they are “E Marked” so will pass the test at VOSA. They have a little box on the wiring that takes care of the US tail/brake/turn feeds and you need only add new brake, indicator and fog light feeds.
For the DIY light converter, these are easiest by far to work with. Several places sell them at various prices, but I always get mine from eBay for around £120-£130 including delivery.
