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The most likely cause is a 'short' in the wiring. Remove the light fitting and take a good look at the connections on the actual light fitting. Look for dirty or damaged parts. Check the wires and the connector blocks are clean, shiny and are not damaged. Then check the light fitting itself for damage. Check the seal where the light fitting fits against the bodywork. If moisture or water is getting past it can affect the lights.
I looked at 5.7l engine. The wiring diagram had old style and new style. The diagram is new style . At the fog lamp the purple wire is voltage, the black wire is ground, check them both. You can see fog lamp relay, the is a fog lamp fuse for you to check. Not only check the fuse, check the fuse circuit for voltage. Use a testlight. The fog lamp relay has no terminal numbers, sometimes that means the relay is soldered into the fuse box, you can't pull it out. Most relays have to sides, the load side, that line with arrowhead. The control side, left side in diagram, needs both voltage and ground. I couldn't get everything in one picture.
This is the diagram for the fog lamps ( headlamp is a different cell ). If you are trying to add them to the existing wiring, do not expect the headlamp switch to cab fuse panel wiring to be there ( that is usually what is missing when you can find the fog lamp connectors under the front of the truck ).
File Save as so you can magnify it with the JPEG viewer you use.
Check fuses,
Note you probably must have parklights 'on' before foglights will operate (Check user manual for fog lamp operation (interlock) requirements),
Check operation of fog light relay (if fitted),
Check fog lamps and bulbs are ok.
Yep it happens http://www.rangey.com/page7.html
Look for cutts in the wiring, tape up. Check all plugs and relays, you can find.
As for diagrammes, either a Haynes of down load a manual, if you have no joy on Google or Alltheweb try http://www.landroverweb.com/Land-Rover-Range-Rover-manual-pdf.htm
There are no front fogs fitted, only the driving lights in the air dam, the switch with the 2 on it lower front dash cluster with rear fog light switch etc.
Depends on how you want to have them come on. On a switch you just control you would have the switch control a relay that is supplying power for the fog lamps. If you want them on all of the time find and ignition wire to conrol the relay for the lights.
The common thing in both of these systems is a relay. You must put one in the system. The fog lamps will draw to much amperage for a toggle switch.
The link below is a Typical fog lamp / driving lamp hookup. Keep in mind that in most states, for these lamps to be 'legal' (and thus pass inspection), you must wire them such that:
1. You can cut them off (in other words, there must be a switch installed to turn them off)
and
2. They may only be operated with the low beams. (therefore, you must power your on/off switch from the low beam circuit)
Hope this helps!
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