D4 Electric Trailer Brake Wiring

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Originally Posted by VK3GJM

Hi,



Any photos available on the proposed mounting of the remote control in the headlight facia.



My task this weekend in the installation of the Tow Pro.



By the way, if trailer magnets progressively need more current/longer duty cycle to apply a greater force for braking, a 3 amp diode something like a 1N5404 may not be sufficient, the voltage drop and then heat it needs to dissipate may limit the diode's life and could fail when extreme proportional force is needed.



Redarc suggests that the Tow Pro could deliver nominally 18 amps, a single axle trailer could proportionally draw 6-9 amps each depending on braking condition.



At minimum I would suggest a 6 amp axial diode, Jaycar has a P600A. Cat no. ZR1024.



I am a bit amused why LR has never installed a separate electric brake control wiring harness/plug. My previous v10 Touareg was truly plug and play.



My install, will be interesting, as I have already fitted a full Kaymar rear wheel carrier, which has A full complement of LED's, only minor issue is LED indicators flashing each time any door closes.



More to come after the job is done. I will create a full set of PDF instructions.



Regards



Gerald

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The diode should be upstream of where the ebc brake wire connects into trailer loom so the amps shouldn't be flowing through it - it should be resisting. I'm pretty rusty on my high school electronics so I may be confused by what you mean when you are talking about the voltage drop & heat might simply be from resisting the backward flow

Hi Meken,

Upstream /downstream, if it is in series the same rules apply.

The only other option is across the magnets, thus preventing back EMF, a common effect with any coil.

Regards

Gerald

Quote:

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Originally Posted by VK3GJM

Any photos available on the proposed mounting of the remote control in the headlight facia.

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I just had the tow pro installed in the headlight switch area yesterday. Unfortunately for you I didn't get any photos and the car's not actually due for delivery until next Monday.

BJM - who did your install? ...although I guess you can't recommend it until you've seen it/used it!

Neil Buckby Motors had a local Auto Sparky called Carswell Automotive install it.
I will post photos when I can. I'm itching to see it myself.

Quote:

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Originally Posted by BJM

I just had the tow pro installed in the headlight switch area yesterday. Unfortunately for you I didn't get any photos and the car's not actually due for delivery until next Monday.

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BJM,

Where did they mount the control unit of of interest.

Just a quick shot of where I mounted the remote head. Very easy to install and gain access to the light control panel.

Spent the afternoon trying to trace back the trailer harness cabling. There must be another plug/socket somewhere else to plug a controller in.

Does anyone have detailed information on the electrical system, wiring diagram?

Regards

Gerald

Gerald,
Don't waste your time. There is NOT one in the D4.
Have pulled many vehicles apart looking for this ilustrious plug.

Only in the V8 HSE spec for the USA market i was able to find out.

Mounting the ControlModule needs to be mounted solidly as if you read the instructions, if it moves it will need to be re-calibrated.

Cheers

Hi Pete,

Thanks for that. Where does pin 7 wire go to, it appears to follow the loom from left rear to left front?

Regards

Gerald

Pin 7 is L/H Tail Light circuit & runs from the CJB down the L/H/S of the vehicle to the wiring harness plug.
Don't forget this wire starts as a "Brown" wire from the CJB & the goes into a Splice joint then becomes 2 wires.
Brown-Pin 5 L/H park light circuit (we modify this to feed the Electric trailer brake circuit)
Black-Pin 7 R/H park light circuit.

Hi Pete,

Thanks for that. OK, diode explained, 1N5404 or similar 3 amp axial diode is fine in that application.

Regards

Gerald