Fog Light Modification E39 - BMW Forum -

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post #1 of 2 (permalink) Old 10-20-2003, 04:38 PM Thread Starter
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Can anyone tell me which pins to short on the light switch to allow the fog lights to turn on and off independently of the parking/head lights. I made the mod to my old 3 series and would like to do the same to my 2000 540 sport. Thanks.
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post #2 of 2 (permalink) Old 10-25-2003, 11:09 PM
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Here are the e28 instructions for the complete euro wiring.

European Headlight Wiring(how to convert from US)

They way you need to rewire it is as follows.

First you will need quite a few butt crimp end connectors. You will also need the proper Euro plugs to plug on the back of the lights. Now this is what wiring you need to do.

Disconnect the battery.

First, you need to locate pin number 85 in the low beam relay. Once locating this, mark it and remove the relay. Mark the exact plug it is. Then open the fuse box. Be careful as you don't want to pull any of the wires too hard. Then locate the other side of pin 85 on the low beam relay. You will see that it is a loop. What you need to do is find the one wire that runs between pin 85 and the high beam relay. This wire needs to be cut at the high beam relay. You want to cut it as close to the connector on the back of the high beam relay as possible without damaging the other wire coming out of the connector on the high beam relay. Now with this cut, strip it, and put a butt end connector on it. Then you will want to run a new piece of wire through the lower rubber grommet. After running this wire through the grommet, attach it to the other end of the butt end connector. Tape everything up, and close up the fuse box. Now with the wire on the outside of the fuse box, you want to run that to a ground. I run it to the main ground on the fender.

Now time for the lights. Remove the old lights. Now you will see 2 connectors that look like U s. The one on the high beam has 2 wires in it. One is a ground(brown) and the other is the power(white/blue or white/purple) from the relay. The power has 2 wires coming out of the connector. The one that runs to the low beam you want to cut. MAKE SURE YOU CUT THE RIGHT ONE! You can test by pulling on the wire on the low beam side and see which wire moves. That is the one you want to cut. Now, once that is cut, you want to pull it through to the low beam side. This will give you some extra wire that you will need later. From what I remember the Euro connectors on the back of the lights are different than the US ones. You can do this next step 1 of 2 ways. First you want to remove the female spade connector from the plastic. DAMAGE THE PLASTIC, NOT THE CONNECTOR. Once you have the connectors removed, you can either just plug them on the back of the light, or you can insert them into the Euro connectors. If you have a used Euro harness, when removing the female spade connectors, damage the metal when remove them from the EURO harness. This will preserve the plastic which you will need when you insert the spades on your wiring harness. Once you have done this for the high beam, then it comes to wiring the low beam. The ground(brown), a low beam power wire and you will have another wire which is loose. That would be the old high beam which you now are going to make into the street light. This is done by removing the side marker light in the bumper. You will see that it has 2 wires going into the connector. What I did was spliced in this wire into the power lead to the side marker light. This will turn on the street lights in the head light at the same time you put on the parking lights. And as for the third and final wire, that is the low beam wire. This does not need to be modified and connects directly into the plug or to the back of the light. Once this is done, then insert the Euro lights, and you will need to then wire the caps to the backs of the lights. Make sure that all of your connections are the same. For example you have the ground to the ground and the power to the power for the correct bulbs. There are 3 prongs on the back of the H4 bulb, one of these is ground, one is low filament and the other is high. You can place the low beam lead on either one of the filaments and then change them to see which you like better.

What this accomplishes is that when you turn on the high beams, the high beam lights come on, the low beams stay on, instead of switching filaments, and the fog lights stay on. This is the way the Euro cars work.

Written by Rob Anderson '01

More clarification on the Euro lights

Well the way I have it wired up, which is the Euro way. Even though the H4 has 2 filaments, the Euro wiring only uses one. So what happens is that when you put on the parking lights the 4w bulbs turn on. Then if you flash the brights, only the center lights(high beams) turn on. Now, you put the switch in the second position and you will find that the low beam will turn on and the 4w will stay on which is how it works in the Euro cars. Now, if you put on the brights, the low beam and the high beam are both on, but the filament used in the low beam is the same all the time. You only use one filament in the low beam. In the US wiring, both filaments are used in the low beam so when you turn on the high beam, the low low beam filament turns off and the high low beam filament turns on. You have to eliminate this to have them wired correctly. By the way, the fog lights will also remain on when you have the brights on. So basically if you have the low beam on then you have filament number 1 in the low beam on and the fog lights. Now you put on the high beams. In the Euro wiring, filament number 1 remains on and so do the fogs and then the high beam turns on.

This is an e24 diagram but the issues are the same, fuses and relay IDs may be different, pins will be the same.

So get a different source of power to pin 85 on fog relay.


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