Headlights

Johnroo · Sunday at 10:13

Hi new to this but hope someone can help.

My discovery 300tdi is having a headlight problem. So when the headlights are on normal drivers side is on main beam but slightly brighter than normal and the passenger side is very dim looks like the side light is on.

I have cleaned and checked the plugs going to the bulb and all the earth's that I can find I also unplugged the resistor but that didn't make a difference I have tried another relay I'm not sure if there is any more.

Thanks in advance.

Dippypud · Sunday at 10:36

Headlight wiring upgrade

Found this on another forum - hope it helps. It might well resolve the molten headlight plug problem and, because the headlight power is straight from the battery, will ensure maximum power goes to the lights. the wiring diagram above is for a generic headlight wiring loom up grade and...

www.landyzone.co.uk

Discovery - headlight conversion to 2003 on lights

I carried out this conversion some years ago now but here is the guide below for anyone that needs it. Prices quoted were correct in 2004! This guide has been compiled based on my own experiences in carrying out the Discovery light conversion. Whilst it has been carried out to the best of my...

www.landyzone.co.uk

discool · Sunday at 11:23

Johnroo said:
Hi new to this but hope someone can help.

My discovery 300tdi is having a headlight problem. So when the headlights are on normal drivers side is on main beam but slightly brighter than normal and the passenger side is very dim looks like the side light is on.

I have cleaned and checked the plugs going to the bulb and all the earth's that I can find I also unplugged the resistor but that didn't make a difference I have tried another relay I'm not sure if there is any more.

Thanks in advance.

Check the headlamp bulb earth connection on the body (black wire) and/or replacing both headlamp bulbs with brand new ones.

And leave the resistor disconnected of remove the relay as you don’t need the dim-dip feature.
Also the relay modification above was suggested because the earlier RR and the 200 series disco had iffy wiring which was redesigned and up graded fo the 300 series so theres no reason for that mod with your disco which also has a possible fault potential.

Dippypud · Sunday at 13:55

discool said:
Check the headlamp bulb earth connection on the body (black wire) and/or replacing both headlamp bulbs with brand new ones.

And leave the resistor disconnected of remove the relay as you don’t need the dim-dip feature.
Also the relay modification above was suggested because the earlier RR and the 200 series disco had iffy wiring which was redesigned and up graded fo the 300 series so theres no reason for that mod with your disco which also has a possible fault potential.

I bow to superior knowledge ...

Johnroo · 2025-02-25T15:16:43+0000

discool said:
Check the headlamp bulb earth connection on the body (black wire) and/or replacing both headlamp bulbs with brand new ones.

And leave the resistor disconnected of remove the relay as you don’t need the dim-dip feature.
Also the relay modification above was suggested because the earlier RR and the 200 series disco had iffy wiring which was redesigned and up graded fo the 300 series so theres no reason for that mod with your disco which also has a possible fault potential.

Hi yes i have replaced both bulbs and unplugged the resistor is there 2 plugs for it or just one. Thanks.

discool · 2025-02-25T18:07:50+0000

Hi, the resistor is fitted on a heat sink/bracket which is mounted on the rear engine bay bulk head, or was when the vehicle left the factory, there is only one double pin plug, so just remove from its socket and tape it up and leave it at the side.
And then the dim dip function will be inoperative.

Headlights

Johnroo

New Member

Dippypud

Never Knowingly Understood

Headlight wiring upgrade

Discovery - headlight conversion to 2003 on lights

discool

Well-Known Member