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Old 7th November 2011, 08:27 PM   #1 (permalink)
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4 Led Rear lights

Hello all,
I have been looking for a conversion kit to convert my GTR to have all four LED rings light up with the side lights - and I know that there is a Zele kit and an MCR kit - but they seemed to be a bit pricey for me.
So while bored yesterday I thought how hard can it be?
I removed the rear plastic panels which allowed me to gain access to the back of the lights.
Armed with a multi-meter I set about locating the tail light positive feed on the plug from the car loom - which is easy to do as you can leave the tail lights on while probing with the meter until I got a positive voltage. I turned off the tail lights and using the wife - I got her to press the brake pedal until I got the wire with the voltage.

Using two cheap diodes I spliced into the car's loom one diode inline with the brake wire - with the triangle symbol facing towards the lights. Using the other diode I bridged the tail light wire and the brake wire (after the first diode in the brake wire) with the triangle symbol facing the brake wire. I used heat shrink tubing to cover my soldering and a insulated the lot with tape.

I repeated the same on the other side - and it works
I have used the car for several hours and the diodes do not get hot - the brake lights work - and the four tail lights work - so far so good.

I have a wiring diagram - but I cannot up load it for some reason.
The diodes are 1n4001 diodes which are pennies from Maplins. The down side is that I have had to modify the cable as the connectors on the car look very bespoke.

hope that it helps someone !!
Shaun
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Old 7th November 2011, 09:31 PM   #2 (permalink)
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Do all four light up when you brake too then?

Would be great if you can get actual pictures up of the wiring
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Old 8th November 2011, 07:59 AM   #3 (permalink)
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4 LED

the tail lights light up all four rear LED rings - but when the brake pedel is pressed the two inner rings glow brighter than the outer rings along with the brake light under the rear spoiler

I dont understand why I cannot post an image of the wiring diargram on this forum - it says at the bottom left that I cannot.

if you PM me your email address I can send the diagram

regards
Shaun
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Old 8th November 2011, 02:25 PM   #4 (permalink)
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Originally Posted by mad_shaun View Post
the tail lights light up all four rear LED rings - but when the brake pedel is pressed the two inner rings glow brighter than the outer rings along with the brake light under the rear spoiler

I dont understand why I cannot post an image of the wiring diargram on this forum - it says at the bottom left that I cannot.

if you PM me your email address I can send the diagram

regards
Shaun
pm me too
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Old 8th November 2011, 03:28 PM   #5 (permalink)
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Shaun,

Excellent, can you PM me as well please.

How did you splice into the cables? Vampire connectors?

Many thanks

D
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Old 8th November 2011, 03:56 PM   #6 (permalink)
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Here you go:

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Old 8th November 2011, 04:22 PM   #7 (permalink)
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4 LED lights

Hi - there is a cable that come from the light cluster into a plug and socket.
I found it a bit tricky to access the wires from the connector back to the cars's loom, so I unwound the insultation back and the corrogated tube until I had enough to splice into on the cable that went from the connector to the rear light cluster.

I cut the cables that I needed so that I could slide on some heat shrink . I stipped the ends and connected the diodes and then soldered them together.

I used solder as I have had cables break apart in the past.

regards
Shaun
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Old 8th November 2011, 06:33 PM   #8 (permalink)
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Hi Shaun,

Thanks for this, can you give us colour codes for the wires please?

Any chance of a picture?

Cheers

D
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Old 9th November 2011, 08:39 AM   #9 (permalink)
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LED rear lights

I was so aborbed I forgot to put the wire colours on.

If i get home tonight and its still light I will take a couple of Photos.

regards
Shaun
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Old 11th November 2011, 10:05 AM   #10 (permalink)
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For the cack handed amongst us, in case anyone is wondering about kits that are cheaper than the Zele and MCR ones, GTC do a plug and play 4 light kit for around £100, which uses the standard connectors. Even I managed to fit it, so it must be foolproof.
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Old 11th November 2011, 11:36 AM   #11 (permalink)
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Hi Shaun,

Thanks for this, can you give us colour codes for the wires please?

Any chance of a picture?

Cheers

D
From memory the Brake light is Green with a yellow trace and rear lights are Green but with a red trace.
This mod can be done, but the GTC light kit is a very simple plug and play solution to this.
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Old 11th November 2011, 11:50 AM   #12 (permalink)
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True, but the diodes cost like 10p or something
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Old 11th November 2011, 01:25 PM   #13 (permalink)
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4 LED lights

Dear all,

the rear lights are identifed as a green cable with a red line in it
the brake lighrs are identided as green cable with a yellow line in it.

All in all I reckon it cost me £5 as I needed to get two differant sizes of heat shrink - thus a massive saving on the plug n play units.

It can be very quickly reverted to normal as I inserted a small lenght of cable So I can easily cut / unsolder and return to normal.

regards
Shaun
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Old 14th November 2011, 07:37 PM   #14 (permalink)
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4 led

Thats the biggest benefit with the kits - they have the right plugs and sockets
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Old 16th November 2011, 10:22 AM   #15 (permalink)
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On a bit of a side note. Would be interested in a kit that lights up all 4 with the "lights on" and then also lights up all 4 brighter under braking.

Is this what the MY2011+ does?
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Old 16th November 2011, 12:57 PM   #16 (permalink)
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4 LED lights

To have the four lights go bright under breaking - I would move the Diode that bridged the brake and tail lights togther and replace with a piece of wire.

the diode that was moved to go in line the tail light light the brake diode.
This will prevent the sidelights coming on when you brake during the day.
I would keep the diode inthe brake line so that when the car has side lights on - the four rings light up. But when the brakes are applied the four rings will glow brighter along with the top level brake light




regards
Shaun
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Old 16th November 2011, 02:49 PM   #17 (permalink)
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Shaun,

You could fabricate some kits, a few dip switches and people could configure how they have want their lights to work....

anyone know where we'd get the correct plugs?

D
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Old 16th November 2011, 02:53 PM   #18 (permalink)
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Shaun,

You could fabricate some kits, a few dip switches and people could configure how they have want their lights to work....

anyone know where we'd get the correct plugs?

D
Yea basically the kit that Ben does but, all 4 light up as well under braking (like the MY2011). Be nice to have a plug n play kit.
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Old 16th November 2011, 04:04 PM   #19 (permalink)
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The thing is I can get all the components, boxes, wire, diodes, dip switches etc for under a tenner and I suspect could knock the circuit up in under an hour. I'd only want to do it if I could get the right plugs though.....

So, anyone got any ideas?

D
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Old 19th November 2011, 02:14 PM   #20 (permalink)
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Tested this today on a '59 plate GT-R and I observed that as soon as voltage was applied (via diode) from the rear light (green/red) circuit to the brake light (green/yellow, post brake light circuit diode cathode) the brake light illuminates with high intensity, schematic:
Four tail light cluster
Four Tail Light Cluster Schematic.jpg

Did you have to do anything else to get the brake (inner) lights to illuminate with the same (normal) intensity as the rear lights?

Although it was not was I was aiming for, four brake lights do work and it looks cool, schematic:
Four brake light cluster
Four Brake Light Cluster Schematic.jpg

Protegimus
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