Thread: Trailer Wiring Nightmare!

LED lamps on the trailer?

Yeah, LED's. Does this make a difference to sensing the trailer is connected?

Yes!

Read these threads for far more useful info ...

http://www.aulro.com/afvb/d3-d4-rrs/...er-lights.html

http://www.aulro.com/afvb/d3-d4-rrs/...an-lights.html

Regards,

Les.

Could.
LED tail lights have such a small load the indicators need an in line resistance so the flasher can will work correctly.

Hi,
LED lamps have a high resistance and thus a small current draw.
Not enough Amps being used to trigger the older style of bimetalic flasher can or perhaps trigger the vehicle trailer sensing system.

That is if LEDs are causing the problem.

cheers

Thanks all.

With more searching around it sounds like this doesn't seem too uncommonm and the LED's in the trailer just might be the problem, although I'm not getting the blinking or fast flashing the some people report. My trailer lights all work OK, its just the vehicles doesn't sense the trailer as being attached.

If it is this, then it sounds load resistors in the indicator and brake circuits are needed on the trailer. I'll go to Supercheap tomorrow and buy 3 of them and fingers crossed that fixes the issue ...

In your original post you imply you are not using the standard plug fitted to to the car "as it was resin filled" - how exactly is you 7 pin plug wired into the car - when used with incandescent trailer globes the OEM wiring is linked into the computers and switches off rear sensors and a whole lot of other things and on the D4 turns on towing assist.

Now if your trailer plug is bypassing the OEM system then the computers will not know there is something attached and switches nothing on or off even though your trailer lights will work.

Why didn't you use the OEM socket - adapters are available from Super Cheap and I use one on my box trailer - it works fine (be aware the Disco is wired to the European spec so there is not one power wire that feeds both tail lights but has one power wire for each tail light - when matched to a aust spec wired trailer with electric brakes it means one of these tail light feeds is plugged into the trailer brakes so when you turn on the lights the trailer brakes come on.

Now as you said the OEM plug is full of resin and cannot be tampered with but somewhere in the back is a trailer wiring loom fuse box (I have a RRS so do not know where it is in a disco) so you can cut this second trailer light feed wire and feed in what you want (electric brakes feed). Also on the standard 7 pin plug there is a facility for reversing lights and aux so these can be used to feed the break away battery - just not sure whether there are any spare slots on the fuse box and OEM socket.

Clear as mud????

Then we need to look at the LED issue - don't pick on the Landy for this - the new VW Amorak is the same but woulodn't you think the importers would Australianize the cars before sale.

Garry

G'day,

There is a short but useful video on the LRA web sight that explains the operation of tow assist and how it's activated. Discovery 4 Photos & Video | Land Rover Australia

I used a Dremel to remove some of the resin so I could run the electric brake wire direct to the correct pin, (don't like joins) then repacked it with silicone.

Cheers Colin