D3 Brake controller wiring

[hpal]

Hi All,
I know this has been covered but need some clarification and help to get my head around the wiring in the rear compartment and snipping brown wires and putting in diodes etc. I think maybe I need to run the red wire back to the fuse compartment but not 100% on where to go from there, help appreciated, thanks152256

[hpal]

OK I've run the service brake wire all the way to the plug on the bumper, that's all good.
I realize I need to snip the brown wire, all good.

Do I need to run the brake light signal wire from the rear fuse compartment or can I use the pickup from the glovebox area as shown on my diagram? If I pick it up from there what would be the consequence and do I still need to do the diode thing?

Can someone draw me something a bit clearer regarding the diode placement? I've seen blurred photos and not-so-obvious diagrams but nothing I can follow, thanks in advance :)

[Markus1]

Pick up the brake signal from the rear. The diode? ---No one has properly explained why it is needed or highlighted what happens should it fail.

[hpal]

Thanks for the reply mate,

I still can't seem to locate the hi res photo of Sneigy's which would explain a bit more of the diode situation, but i can't read the writing on the low res image!

[hpal]

Diode placement (photo 1)



In the first picture does the diode go in position 1? (between grey plug going into wiring loom) or position 2 near fuse box?
Is the orientation/polarity of the diode correct?


Snip brown wire (photo 2)



Snip brown wire, does the fuse end connect to anything? just tape it up?
Will it affect anything (ie brake/tail lights function) if I, as planned, run the blue wire all the way down to the trailer plug at the bumper??


Fuse box (photos 3 & 4)

Does this look correct??

Thanks in advance, with confirmation I want to connect this up on the weekend.

Cheers

[Markus1]

D3 Electric Trailer brake wired-photo (https://www.aulro.com/afvb/the-d3-d4-sticky-zone/51521-d3-electric-trailer-brake-wired-photo.html)

Read past the first photo as there is clarification on the position of the diode. The first photo has the diode on the red wire ....that is wrong. Imo your wiring diagram makes sense as you have put the diode on the green car wire. The diode should be placed 'upstream' of the cut - i.e. the hot end of the wire. If unsure this can verified with a multimeter and a brick on the brake pedal. Don't worry if you place the diode the wrong way around. it'll tell you pretty quickly as your brake lights won't work, no harm done, just reverse it.

[hpal]

OK, got the job done and here are my pictures and wiring diagrams hopefully to help people in the future.

I used some little heat shrink solder joiners to join the diode onto a piece of wire and spliced it into the green/purple wire as shown in the photo. Then snipped the brown wire, you can splice the blue wire into it here but I went all the way down to near the plug so I had heavy wire going into the plug. I took my power and earth straight from the battery through the firewall via a 30A auto reset circuit breaker but you could pickup power and earth at the rear as others have done.

It all works as it should and the trailer lights come on when the manual controller activation is pushed. I fitted the unit in the ashtray and it's very neat and easy to reach, just required pulling the surround and console out to access and drill a hole for the wires at the back of the ashtray.