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Rear light goes out when braking
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Andy Foster
 


Member Since: 27 Dec 2009
Location: Liverpool
Posts: 6551

United Kingdom 2015 Discovery 4 3.0 SDV6 SE Tech Auto Santorini BlackDiscovery 4
Rear light goes out when braking

Drivers side rear light goes out when breaking. It's the bulb with the twin filament. Tail light lights up but when breaking goes out and break light does not work. Is it just a case of replacing the bulb and will Halfords stock them.

Cheers

Andy
 D4 MY15 SE TECH
D3 gone but never forgotten. 


Last edited by Andy Foster on 14th Jan 2017 1:54 pm. Edited 2 times in total 
Post #176306913th Jan 2017 10:19 pm
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BAZ8046
 


Member Since: 26 Feb 2010
Location: Chatham
Posts: 278

2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

If one side goes out when the brake lights come on it is usually an earth fault with the light unit.
I would trace all the earths back first and check the earth points are tight.
I think the rear light units earth in behind the rear panels in the boot.
 D4 2016 Landmark, Waitomo Grey.
D3 2005 HSE, Bonatti Grey, now sold but still comes back for servicing.
Defender 2002 Td5 Commercial, had a hard life but slowly being restored.
I only work so I can afford to repair my Land Rovers! 
 
Post #176309813th Jan 2017 11:38 pm
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Biffysun
 


Member Since: 09 Jul 2011
Location: Central
Posts: 1786

Scotland 2016 Discovery 4 3.0 SDV6 SE Tech Auto Corris GreyDiscovery 4

Also worth taking the bulb out, cleaning the contacts and a squirt of contact cleaner down the socket can help Thumbs Up
  
Post #176310513th Jan 2017 11:55 pm
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Narpy
 


Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830

2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

You clearly have a stop and tail bulb with a blown stop element. I think the tail light is supposed to go out under braking ( or "breaking" as you seem to incorrectly prefer Rolling Eyes ).
As has been written many, many times on the forum, the bulb immediately next to the brake light bulb ( not the indicator bulb ) is also a stop and tail type, but only the tail element is used by the car. You can therefore swap the two bulbs over and normal service will be resumed. Thumbs Up
If you click the Twin Brake Lights link in my signature there's pictures etc., it may help.

Stop and Tail bulbs are available from any auto factors including Halfords but it is wise to buy the best quality ones you can find to prevent upsetting the D3's electrics.
 Mods:
Front Fogs + Halos
FBH Remote Control
The 1st Ever RRS Modded Grill
Garmin Nuvi + D4 Surround + Reversing Camera.
D4 Steering Wheel.
Rear Boot Spoiler.
Twin Brake Lights.
Wing Mirror Indicator Repeaters.
Long Roof Rails
Make your own Narpy grill thread
I'm not scared, I'm outta here. 
 
Post #176315914th Jan 2017 9:51 am
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Biffysun
 


Member Since: 09 Jul 2011
Location: Central
Posts: 1786

Scotland 2016 Discovery 4 3.0 SDV6 SE Tech Auto Corris GreyDiscovery 4

Idea If the lights are on, the tail lights are on all the time, when the brake is applied the 'stop' light filament lights up brighter 21W 8) The bulbs are the same and can be swapped no probs Thumbs Up
  
Post #176319514th Jan 2017 11:32 am
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Narpy
 


Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830

2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Genuinely don't know if that's right Biffy but if it is, like a man in an orthopaedic shoe, I'll stand corrected. Thumbs Up
 Mods:
Front Fogs + Halos
FBH Remote Control
The 1st Ever RRS Modded Grill
Garmin Nuvi + D4 Surround + Reversing Camera.
D4 Steering Wheel.
Rear Boot Spoiler.
Twin Brake Lights.
Wing Mirror Indicator Repeaters.
Long Roof Rails
Make your own Narpy grill thread
I'm not scared, I'm outta here. 
 
Post #176320314th Jan 2017 12:01 pm
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Biffysun
 


Member Since: 09 Jul 2011
Location: Central
Posts: 1786

Scotland 2016 Discovery 4 3.0 SDV6 SE Tech Auto Corris GreyDiscovery 4

Laughing No worries Thumbs Up
  
Post #176321414th Jan 2017 12:16 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Yeah biffy is correct.
  
Post #176323814th Jan 2017 1:29 pm
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Andy Foster
 


Member Since: 27 Dec 2009
Location: Liverpool
Posts: 6551

United Kingdom 2015 Discovery 4 3.0 SDV6 SE Tech Auto Santorini BlackDiscovery 4

Swapped bulbs and all is good and yeah the tail light stays on when braking Thumbs Up

Cheers all

Andy
 D4 MY15 SE TECH
D3 gone but never forgotten. 
 
Post #176325914th Jan 2017 2:34 pm
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