Thread: D4 Electric Trailer Brake Wiring

Originally Posted by Stuart02

Does anyone happen know of a round to flat trailer plug adapter with a resistor built in? I hate wiring that much...

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No, but I can happily make you one.

I want to get a Redarc TowPro installed in a D4, along with auxilliary power to a trailer, and it needs to be a professional job, which rules out me as the installer!

Back in this thread, ATV Automotive at Five Dock were recommended.

Can anyone recommend another good installer on the north side of Sydney please?

Originally Posted by Disco4Dave

I want to get a Redarc TowPro installed in a D4, along with auxilliary power to a trailer, and it needs to be a professional job, which rules out me as the installer!

Back in this thread, ATV Automotive at Five Dock were recommended.

Can anyone recommend another good installer on the north side of Sydney please?

With the information provided in this thread and the information thats readily available here (and on his website) from Traxide, I reckon the only difference between an OK job and a "professional job" is time and care. Both of which you will afford more to the job than a sparky would, plus at the end of the day you know its done right.

In all seriousness, Id suggest you read and re-read this thread, buy the Tow-Pro and get cracking.

I was a bit iffy about doing my trainer brakes a few weeks ago, but its not at all difficult, the aux power is also just as straight forward.

The hardest part for me was holding the short wire on the loom plus diode plus soldering iron plus solder and getting everything in the small space without warming up my fingers!

Tools required for the job are simple:
- Various sized drills upto 10mm (for the redraw switch/dial) - sneak up on the 10mm rather than go straight to 10mm
- cable snips
- cable ties
- electrical tape
- a feared/blue/yellow cable connectors
- soldering iron & solder (although at a push you could probably crimp that too)
- Pliers (if you dont have a crimp tool)
- Whilst not essential Id recommend 3 or 4 M4 nuts & bolts so you can bolt your tow-pro module to the aluminium panel behind the headlight switch)
- Patience and a print out of the salient points of this thread (there are 3 or 4 from memory).

Im on the northern beaches - happy to have a chat / lend a hand if it helps.

Jon

Thanks for that encouragement and advice Jon.
However, I have removed interior panels in cars before, and it has sometimes not ended well, with broken tabs, or new squeeks and noises.
I am picking up a new D4 today, and it is by far the most expensive car I have owned, and so I am wary of a doofus like me pulling it apart. SWMBO would be unbearable if I stuffed up :-)

Originally Posted by Disco4Dave

Thanks for that encouragement and advice Jon.
However, I have removed interior panels in cars before, and it has sometimes not ended well, with broken tabs, or new squeeks and noises.
I am picking up a new D4 today, and it is by far the most expensive car I have owned, and so I am wary of a doofus like me pulling it apart. SWMBO would be unbearable if I stuffed up :-)

Mate, that was the single biggest non-technical issue I had. I was in exactly the same boat a few weeks ago. Pulling $100k car apart takes some doing the first time.

Slow and steady wins the race though, and it'll save you $1200 - Or at least thats what I was quoted in Brookvale (not sure if that included the controller or not - I wasn't bothered once Id heard the cost!!).

Have installed Tow Pro Elite and the unit does not seem to be calibrating
The blue diminishing led when in breathing mode and no trailer connected works however when van connected and driving, calibration does not occur and there are no LED lights at all.
Performed the test as per Redarc instructions when first installed and test light works.
According to the trouble shooting if no LED lights when trailer connected then there is a bad connection.
Any thoughts or have I missed the obvious

Howdy Brucester!

If the TowPro doesn't sense a load it will not calibrate. So either there is a cable issue or insufficient load.

What is the brake load on the TowPro (the brake type at the end of the blue wire)?

Are you certain that you picked the correct cable (brown) to connect with when you split the wires (at SJ571) in the rear cubby?

For some brake types Redarc state that you may need a 21W resistor across the load. I was worried about this as my trailer has a disc brake controller (AL-KO iQ7) and does not present as much load as standard electric brakes.... but worked ok for me.

Gordon

Thanks Gordon
The camper is a Complete Campsite Exodus 11 with drum brakes and weight is around 1800kg.
Wired the unit as shown on this forum and connected to the brown wire in the LHR.
I have checked all my connections and they appear fine.
As you say it may be a wire connection and is there a way of checking this.