D4 Electric Trailer Brake Wiring

You mentioned finding the brown wire cut at the trailer plug. I assume you mean right behind the plug? Can you just follow that brown wire backwards along the bumper and up behind the taillight and then into the vehicle? This can be done on D3s and D4s. Have you read right through the early parts of this thread and the D3 one to see if there’s mention of RRS differences?

I will do this, pain in the A to take bumper off but i might have too.

The splice is just not where the thread says it should be - under the barcode in front or behind the taillight. Or anywhere i can see after 3 attempts.

So close yet so far.

Will keep you posted.

Cheers

Jeremy

Ok, so I took the rear bar off, along with some bumper reinforcement.

It felt damn good to find a splice down near the bottom end of the loom.

Pretty sure my wiring is correct.

Photos below :)

Shared album - Jeremy Taylor - Google Photos

If I have this wrong, can someone please let me know.

Thanks

Jeremy

Thank you, thank you, thank you.
We recently purchased a MY 16.5 HSE Discovery. Intention is to tow our AOR quantum.
Needed to fit electric brakes, so started to read this forum.
The fitting went perfect, and the car is amazing.
Thanks again AULRO.

Hi Sneigy,

My first post so hopefully I get it right. I recently had my 2011 rrs fitted with a Hayman Reese electric brake controller and suffered what appears to be the usual problem of trailer brakes being activated when I turn on my headlights. I've had difficulty following other threads. My question is - can I follow your instructions for wiring a D4 on my rrs? Thanks in anticipation

Yes

Quote:

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Originally Posted by White D4

Hi Again

I was at the dealer where we are buying our caravan from today and he told me that i will need a special adaptor box from LR that connects to the trailer plug. I apparently need this due to the fact the caravan has LED lights and without this box the van will be like dodgy Xmas tree.

I am told this box will set me bag a further $250. Funny thing is i spoke to the landy dealer i am getting the vehicle from and he doesn't know much about this.

Can you shed some light on it for me.

Cheers
Paul

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Hey Paul, yes u need a LED tow connect. I’m in the process of doing this all in few weeks. Google it. You will find a site for them.

Late last year we upgraded our 2012 D4HSE to a 2017 Discovery - just last week I connected the car to our caravan for the first time and discovered that Land Rover has still not changed the electronics in the car to recognise a van with LED lights (in other words, Tow Assist and the trailer icon that is meant to show when the indicator on the van/trailer lights are both not working with our van and its LED lights).

This is 2018 - you would think Land Rover could have reached the 21st century by now. I guess they look no further than the standard pitiful pommie caravan when assessing how their vehicles need to interact with vans and trailers.

Check the thread on home made adaptor:
Trailer connection for Jayco 12 Pin plug

Trailer connection for Jayco 12 Pin plug

Admittedly you do need to be handy with wiring but consider the advantages of being able to plug straight in to the Disco.

Quote:

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Originally Posted by kimbers74

Hey Paul, yes u need a LED tow connect. I’m in the process of doing this all in few weeks. Google it. You will find a site for them.

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For a D4 all he needs is a simple pair of resistors...