↓ Advertise on Defender2 ↓

Home > Technical > 3rd brake light
Post Reply  Down to end
Page 1 of 2 12>
Print this entire topic · 
Snowy90



Member Since: 23 Feb 2015
Location: Surrey
Posts: 482

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Fuji White
3rd brake light
Hi
I am at a complete loss!

My 3rd brake light hasnt been working for sometime. All other brake lights work fine

changed bulbs nothing, then i saw on a thread here about the casing wearing away the power strip so did the jump with a cable.

I now have 12v at all points to the holder, the holder and bulb have continuity and i have bought new bulbs.

It should work, but doesn't, what am i missing!

Please help before i question my sanity!
Post #968312 19th Oct 2022 3:36pm
View user's profile Send private message View poster's gallery Reply with quote
rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2200

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Have you checked the cables in the convoluted rubber grommet/tube which lead to the door? Likely one or more is broken 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale
Post #968314 19th Oct 2022 3:52pm
View user's profile Send private message View poster's gallery Reply with quote
Snowy90



Member Since: 23 Feb 2015
Location: Surrey
Posts: 482

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Fuji White
Hi no i haven't but I'm getting 12v at the socket/bulb holder when the brake pedal is pressed.

Ill have a look though
Post #968315 19th Oct 2022 3:59pm
View user's profile Send private message View poster's gallery Reply with quote
LR Nuts



Member Since: 10 Aug 2022
Location: UK
Posts: 835

 
Check the bulb holder earth point.

Where was the earth lead when you tested and got 12v ?


PS High level brake light is NOT a legal requirement hence will not fail an MOT, but yes its good practice to have it working.
Post #968329 19th Oct 2022 4:59pm
View user's profile Send private message View poster's gallery Reply with quote
Snowy90



Member Since: 23 Feb 2015
Location: Surrey
Posts: 482

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Fuji White
Hi
I just measured off the two connectors to the bulb holder.
Nothing until pedal depressed then 12v
Is there another earth closeby?
It just keeps coming up as an advisory and I will have bikes ina a rack so wanted to get it working.
Post #968331 19th Oct 2022 5:08pm
View user's profile Send private message View poster's gallery Reply with quote
rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2200

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
It is possible to still get 12v on a cable when open circuit but it not be able to provide any current when under load when a cable is damaged.

Try measuring the voltage across the bulb holder with the bulb in place. 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale
Post #968336 19th Oct 2022 6:25pm
View user's profile Send private message View poster's gallery Reply with quote
sharkey964



Member Since: 05 Oct 2014
Location: On a muddy track
Posts: 570

France 2007 Defender 90 Puma 2.4 XS CSW Santorini Black
I had the same problem with no 3rd brake light.
The wiring goes through the heated rear window element,so if you have a break in any of the heater wires within the heated rear window the 3rd brake light won't work.
I bypassed the heated window by disconecting the feed wires to the heated rear window put in a wire from each side to the terminals on the 3rd light.
Hey presto.....3rd light works.
Marc.
Post #968348 19th Oct 2022 7:13pm
View user's profile Send private message View poster's gallery Reply with quote
GuJa



Member Since: 03 Oct 2017
Location: Elsfleth
Posts: 18

Germany 2008 Defender 90 Puma 2.4 SW Tonga Green
The case of the 3rd brake light tends to chafe the electric lines. Remove the case and have a close look where the case and the rear screen come together.
Post #968356 19th Oct 2022 8:08pm
View user's profile Send private message View poster's gallery Reply with quote
LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11240

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
I thought that problem had been solved by 2008 when the heater element was re-designed to go around the brake light casing? Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #968361 19th Oct 2022 8:35pm
View user's profile Send private message View poster's gallery Reply with quote
Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 274

United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
I had the same issue with my 110. Tested fine with 12v across the terminals in the bulb holder but no bulb would light. It's possibly that the strip in the window deteriorates and gives a very high resistance, it'll test ok with a meter but as soon as you draw a bit of current with a bulb you get no volts. I ran a short piece of wire from the spade connector at the bottom of the screen under the rubber seal to the bulb holder to fix the issue. You can barely see that I have had to do this.
Post #968363 19th Oct 2022 8:50pm
View user's profile Send private message View poster's gallery Reply with quote
sharkey964



Member Since: 05 Oct 2014
Location: On a muddy track
Posts: 570

France 2007 Defender 90 Puma 2.4 XS CSW Santorini Black
Thumbs Up

Last edited by sharkey964 on 19th Oct 2022 9:17pm. Edited 1 time in total
Post #968364 19th Oct 2022 9:15pm
View user's profile Send private message View poster's gallery Reply with quote
sharkey964



Member Since: 05 Oct 2014
Location: On a muddy track
Posts: 570

France 2007 Defender 90 Puma 2.4 XS CSW Santorini Black
Penfold_6290 wrote:
I had the same issue with my 110. Tested fine with 12v across the terminals in the bulb holder but no bulb would light. It's possibly that the strip in the window deteriorates and gives a very high resistance, it'll test ok with a meter but as soon as you draw a bit of current with a bulb you get no volts. I ran a short piece of wire from the spade connector at the bottom of the screen under the rubber seal to the bulb holder to fix the issue. You can barely see that I have had to do this.


Exactly what I said/did...
Post #968365 19th Oct 2022 9:17pm
View user's profile Send private message View poster's gallery Reply with quote
Ads90



Member Since: 16 Jun 2008
Location: Cots-on-the-Wolds
Posts: 800

United Kingdom 2007 Defender 90 Puma 2.4 CSW Keswick Green
Penfold_6290 wrote:
I had the same issue with my 110. Tested fine with 12v across the terminals in the bulb holder but no bulb would light. It's possibly that the strip in the window deteriorates and gives a very high resistance, it'll test ok with a meter but as soon as you draw a bit of current with a bulb you get no volts. I ran a short piece of wire from the spade connector at the bottom of the screen under the rubber seal to the bulb holder to fix the issue. You can barely see that I have had to do this.

Same here just a few weeks ago. Multimeter showed 12v but obviously not enough getting through to light a bulb. Same solution, I meant it as temporary but it turned out very neat so will leave.
Post #968444 20th Oct 2022 3:24pm
View user's profile Send private message View poster's gallery Reply with quote
Snowy90



Member Since: 23 Feb 2015
Location: Surrey
Posts: 482

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Fuji White
Makes sense, i never use the heater screen as generally in the garage so not sure if its works properly.

Did you guys run two wires up the rubber? or just one? left or right as your facing it.
Post #968512 21st Oct 2022 9:58am
View user's profile Send private message View poster's gallery Reply with quote
spudfan



Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4497

Ireland 
I ran two wires in the rubber seal and have stopped having issues. I once bridged the element with a piece of tin foil from a chocolate bar which worked until I ran the wires inside the rubber seal. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai
Post #968540 21st Oct 2022 12:49pm
View user's profile Send private message View poster's gallery Reply with quote
Post Reply  Back to top
Page 1 of 2 12>
All times are GMT + 1 Hour

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums