D4 Electric Trailer Brake Wiring

**Delafingcaw** · 8th October 2017, 06:15 PM

Referring to my earlier post on fitting the ECB in Canberra - thoroughly disappointed with AutoCo! After assuring me they knew what they're doing...

The car does not recognise the trailer! After reading all threads on this forum about the LED lights causing issues and me telling them... the D4 does not blink it's little trailer light when turning on an indicator

. I bought a diode from JayCar and cut the red wire and inserted in the red wire, before the EBC wires join it, according to the helpful electrical diagram in the posts earlier, but that doesn't seem to fix the issue. Anyone know what else to do?

I am not confident they connected the wires as they were supposed to - one of the wires from the EBC is connected to a blue cable, not the brown one as suggested on the diagram...

They installed the Andersen plug as requested, but didn't install an interruptor to avoid the car battery run out when the engine is not running. Didn't even ask me if they had to...

They did not connect the reversing lights to the 7-pin I asked them to install. Their comment "oh but most trailers don't have reversing lights!". Again, too much to ask me?

I'm unsure what to do next - take the car back and ask that they fix this free of charge, knowing they do such a bad job at it? Or go and find someone else that I trust more? (the Ezytrail guy connected me with a bloke who inspected the work and seems much more friendly and knowledgeable at the same time).

Danny

**DiscoJeffster** · 9th October 2017, 10:36 AM

The detection of the trailer has nothing to do with the ECB, but is a function of ballast resistors on the trailer providing enough load on an indicator circuit for the vehicle to detect the trailer. If you have LED lights on the trailer, put the Narva 21W resistors on one or both of the trailers indicators in parallel and then it will detect it. Only one resistor is required but for the trailer thing to flash when turning both left and right, you might want to add to both sides.

Biggogs69 · 27th December 2017, 03:39 PM

Hey guys,

I'm currently doing an Redarc tow pro EBC install as per Sniegy instructions, however on removing the rear tail light there is no splice joint.

The brown and black wires appear to be independent, do i just cut the brown and continue as Sniegy instructions or has the wiring changed over the years.

It's a MY12 D4

Thanks for the help...

**LRD414** · 27th December 2017, 05:24 PM

The splice moved from behind taillight to inside rear storage at some point. You can just cut and continue as per instructions from there behind the light.

Biggogs69 · 27th December 2017, 05:54 PM

Originally Posted by LRD414

The splice moved from behind taillight to inside rear storage at some point. You can just cut and continue as per instructions from there behind the light.

Thanks for the quick reply LRD414...

Much appreciated

Towcar · 11th January 2018, 06:04 PM

I a little confused as I have a 2009MY10 RRS

I haven't had the car since New and couldn't see the splice for brown wire anywhere between rear tail light all the way to near rear seat.

I've attempted this 3 times now.

So I spliced the red and blue wires just in front of tail lights and am going to run + & - from the battery.

I soft tested this with a harness I made but Tekonsha didn't turn on. Maybe I need to ground to body.

Bringing up a common thread I know sorry- I haven't got that little fuse panel that d3s sem to have And I can't seem to find splice.

The brown wire was cut when I bought the car at the trailer plug- I found out when I changed to a square plug.

Do you think I can draw earth and power from the white plug if I wanted to? For a temporary fit to?

I've made a harness or am making one that runs through the car as I don't want something permanent and I only tow this boat like 4 times a year.

Thanks
Jeremy
Located in Melbourne

**LRD414** · 12th January 2018, 09:57 AM

Originally Posted by Towcar

Do you think I can draw earth and power from the white plug if I wanted to? For a temporary fit to?

Jeremy, yes power and earth are available in the white 12S plug. There is both constant live and switched power. The cable number designations have been posted quite a few times in threads, probably including this one.

Also, I have deleted your duplicate post in the D3 sticky thread so as to avoid splintering of assistance.

Regards,
Scott

Towcar · 12th January 2018, 09:43 PM

Thanks Scott,

Just can't seem to find this splice for the blue wire into taillight circuit.

If anyone can point me in the right direction I would be grateful.

I've been through the whole look, not with the bumper off however.

Cheers
Jeremy

**LRD414** · 12th January 2018, 10:31 PM

Jeremy what are you trying to do? I’m not following what you mean by blue wire and taillight circuit.

Towcar · 13th January 2018, 04:42 PM

I'm trying to find the wiring that needs to be altered in the loom, there is a brown wire connected to Black which links the taillight circuit to the brake feed I need to cut and re wire.
Can't seem to find it in the loom
Could it be on the other side or behind the bumper?

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