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Old 13 June 2018, 08:08   #1
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Anybody used LED trailer lights with VWs or Audis?

Does anybody have any experience with LED trailer lights on either an Audi A6 (2014) or a VW Amarok (2017). I know there is a chance the CANBUS and bulb failure systems will cause issues but can't find anything specific. I'd like to replace my bulb units but if it's going to be a pain I'll just keep wiggling the bulbs every few trips.

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Old 13 June 2018, 09:23   #2
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I'm trying to find a solution for my BMW X3 on a maypole LED board. SBS commissioned a new 6ft folding board with LED's. The whole set up is a vast improvement on normal cheap boards however the lights do some crazy things.
In an attempt to get a fix I've ordered a PLUG-IN SMART LOAD RELAY FOR LED LAMPS from ATE
http://www.ate-uk.com/plug-in-smart-...0mm-cable.html
Both suppliers (SBS & Ate) have been good and offered to take back there parts if I can't make them.
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Old 13 June 2018, 09:27   #3
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Cant comments on the exact VW/Audi situation but when I built some LED trailer units (that were used on a club boat with a few different vehicles) I used 12V load resistors spliced into the circuits. These provide sufficient resistance to mimic a bulb.
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Old 13 June 2018, 09:47   #4
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I'm using LEDs on a T6 but they have load resistors in the indicators as a throwback to the Disco. The T6 handbook states that if you use LEDs then the alarm integration doesn't work.
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Old 13 June 2018, 11:00   #5
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Quote:
Originally Posted by Pikey Dave View Post
I'm using LEDs on a T6 but they have load resistors in the indicators as a throwback to the Disco. The T6 handbook states that if you use LEDs then the alarm integration doesn't work.
What resistance did you put in to make it all work?
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Old 13 June 2018, 11:03   #6
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They are 21w 5ohm iirc. You can get them from RS for around a quid each. There's a thread somewhere on Ribnet with the details.
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Old 13 June 2018, 12:05   #7
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Quote:
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They are 21w 5ohm iirc. You can get them from RS for around a quid each. There's a thread somewhere on Ribnet with the details.
Yeh

Just checked mine, they're 21W 8.2ohm Only fitted to the indicators and that resolved the "flicker" issue on all the lights and is enough to make the dash "trailer" indicator work. (Volvo XC90)

Bear in mind 5ohms accross what's nearly 15v is almost 3amps....ie 45W. the incandescent indicator bulbs would only have been 25W.

The resistors do get hot as hell and can melt plastic. I've been experimenting with 50watt 12ohm to try and resolve my LED headlamp warning but even those are able to melt plastic after they've been on for about 30mins.
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Old 13 June 2018, 12:09   #8
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8.2 sounds about right, I did qualify it with "iirc". I mounted mine on ally heat sinks. Bear in mind that the indicators are on-off-on-off....... so the current is intermittent & you wouldn't normally have them on for long periods unless you had the hazards on.
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Old 13 June 2018, 13:25   #9
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I'm just about to go through this, lights should be here tomorrow. Already have the resistors with heatsink at home.

Not sure how they will fit in the trailer board yet but will make a low pressure area somewhere I'm thinking to draw the heat out, won't be a big deal and will post up some pics when done incase others tackle it.
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Old 13 June 2018, 13:49   #10
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I would be knocking some permanent waterproof lights up never mind a trailer board there just hassle.
Itís not a big job if you can weld either.
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