Member Since: 22 May 2019
Location: Norfolk
Posts: 304
High level brake light glowing
Walking past the rear of my 2010 D4 tonight and noticed three glowing patches in the HLBL, not as bright as when it’s in use just a dull glow, pulled a few fuses to see if it went off but no luck, it’s a fairly new unit bought from a local Indy, anybody else had this before I go fuse by fuse?
30th Jun 2021 9:59 pm
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Finally got round to investigating this further, I’ve 4.7v at the light with everything off and shut down, anyone know if it’s normal or willing to test theirs?1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
14th Dec 2022 8:24 pm
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Dont suppose anyone has wiring diagrams for the high level brake light? searched around but cant find anything, tried topix but still cant login1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
17th Dec 2022 1:30 pm
Shamrock
Member Since: 16 Jun 2022
Location: South Kerry
Posts: 114
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Thanks you very much 1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
18th Dec 2022 8:38 am
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Small update, unplugged the brake pedal switch and tried pulling fuses which yielded little result, the only fuse to drop the voltage was in the engine bay FL16 which I believe feeds the passenger side fuse box, so I’m guessing there could be an issue with that?? also tried a new light same issue, and tested at the rear lights the voltage is there but they don’t light up, asked the main dealers if I’m missing a resistor or something obvious but they weren’t aware of anything1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
11th Feb 2023 6:38 pm
Dimcandle
Member Since: 06 Feb 2020
Location: North Wales
Posts: 195
Andyyav wrote:
Finally got round to investigating this further, I’ve 4.7v at the light with everything off and shut down, anyone know if it’s normal or willing to test theirs?
Are you getting the same 4.7v to all the brake lights or just the top one?
Eta Sorry, just read your last post and see that you do.
Do you have tow bar electrics fitted? If so try unplugging the harness and see if you still have the problem
11th Feb 2023 11:46 pm
Shamrock
Member Since: 16 Jun 2022
Location: South Kerry
Posts: 114
Just to know, did you change anything about main rear stop lights or about rear number plate lights ?
Did you also checked the ground connection ? Rear number plate lights have the same ground connection.
12th Feb 2023 8:40 am
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Appreciate the input, I have two lots of wiring to the trailer electrics one looks factory the other not so much! I disconnected both but no change, I have changed the rear lights to the black ones and the number plate lights to leds along with the interior lights, I’ve disconnected all these and again no change, with the HLB disconnected the voltage is 7.7v
I’ve traced the loom back and unplugged it along the top of the boot, the voltage goes from the HLB but is present at the plug, from what I can see it then goes down the pillar and I guess to the front of the car? I’ll study the wiring diagrams and try figure out where the other end of the loom is and go from there!
Never a dull moment!!1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
17th Feb 2023 6:26 pm
Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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Last edited by Flatlander on 21st Feb 2023 9:49 pm. Edited 1 time in total
17th Feb 2023 7:00 pm
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Unfortunately not, I did sell them to a local chap he may accommodate a quick check, they were also led and the new to me ones are Landrover Valeo I guess there could be an internal issue with one of them?
Any idea what the resistance should be on each light?1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
17th Feb 2023 7:24 pm
Andyyav
Member Since: 22 May 2019
Location: Norfolk
Posts: 304
Fingers crossed this is the final update!
Hopefully someone will find it of use one day!
Long story but after some more investigations, clutching at straws and some assumptions I connected a relay in parallel to the HLBL which consumes the voltage, assumptions are-
it’s an induced voltage that would normally be consumed
I’ve change interior lights to LEDs taking away the inductive filament lamps
The relay fitted now consumes what the interior lights would have
Not the most convincing argument I know but let’s me think it’s fixed If I get the time and enthusiasm I’ll swap all the interior lights back to prove it…. Maybe1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
23rd May 2023 8:26 am
moose243
Member Since: 01 Jan 2018
Location: lincoln
Posts: 1
so i’ve read your entire post. my 63 d4 3.0 is dimly illuminating 2 of the less in the high level light . i do not have any led interior lights it’s completely standard
did you find a solution ?
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Thanks you very much 
If I get the time and enthusiasm I’ll swap all the interior lights back to prove it…. Maybe
