Thread: D4 Electric Trailer Brake Wiring

Not really familiar with what is in that particular black box (though I can image - a couple of resistors) but surely I would think that thing requires a switch to turn it on and off (ie isolate the load resistors when not needed) otherwise I think the vehicle would always be indicating a trailer is attached even when one is not (assuming it worked properly that is).

No switch?

Nope, no physical switch,

Just the three wires to the indicators and earth, and the cable to the switched power supply at the fuse box.

Originally Posted by Ferret

Not really familiar with what is in that particular black box (though I can image - a couple of resistors) but surely I would think that thing requires a switch to turn it on and off (ie isolate the load resistors when not needed) otherwise I think the vehicle would always be indicating a trailer is attached even when one is not (assuming it worked properly that is).

No switch?

Originally Posted by Baytown

Just the three wires to the indicators and earth, and the cable to the switched power supply at the fuse box.

Ok you have a wire to a power supply at the fuse box so you probably have some sort of switch within the black box itself which is maybe a bit smarter than just physically switching the device on and off line as you need it.

1) You actually have power at the black box from that wire or at least where you have tapped into what ever at the fuse box?
2) The fact you need power to the black box indicates to me you probably need your trailer connected up to switch the box online. When you say you don't see the green trailer icon on the dash, have you actually got your trailer connected at the same time?

Really think you need to be talking to the people you bought it from because wiring in a couple of load resistors in parallel with the trailer lights is pretty simple, there is not a lot that can go wrong. In it's most basic form it is not required to be powered from a switched wire so there is obviously a larger scope for something to be going wrong here.

BTW what did this thing cost. I'm in the middle of making my own. The Labronix modules at ~$270 seemed a bit out there to me since the basic parts cost ~$60 - $70.

Thanks Ferret.

No, the unit does not function at all when the vehicle is fully connected to the caravan and
no trailer sign when indicators are on.

Yep, unfortunately the manufacturer doesn’t include instructions, but I’ll keep searching for info.

The unit was recommended by people here, but I can’t find the thread.

I think it was just over $200 from WA.

Thanks again.

Ken

You say it was from Osborne Park WA. Could be from these people AutoSpark. These guys have a good reputation from friends I know though I have never used them personally.

While they do make a few things themselves (ie in house, unbranded odds and ends) was unaware they made D4 towing modules. Anyway it's something to try if you have no WA point of contact. Perhaps a call to see if it's one of their gadgets.

Originally Posted by Ferret

You say it was from Osborne Park WA. Could be from these people AutoSpark. These guys have a good reputation from friends I know though I have never used them personally.

While they do make a few things themselves (ie in house, unbranded odds and ends) was unaware they made D4 towing modules. Anyway it's something to try if you have no WA point of contact. Perhaps a call to see if it's one of their gadgets.

The unit is definately from Osborne Park AutoSpark and instructions should have been included, give Tim Wright a call (08) 9443 3411. An ON/OFF switch is included see image attached, I can't quite see the switch end in Baytown's picture from post 659.
box.jpg

Thank you Tank mat.
Fantastic help, but no, there certainly were no instructions.
Ill remove the wiring from the front of the unit to see what is there. I can’t remember from when I installed it 8 months ago. I wouldn’t be surprised it it does have the switch and I’ve failed to turn it on.
There was a lot going on in my life when I first fitted it.
Ill get back tomorrow with what I find, but I certainly don’t discount a major embarisment on my behalf!
Thank you again.

Ken

Originally Posted by Tankmat

The unit is definately from Osborne Park AutoSpark and instructions should have been included, give Tim Wright a call (08) 9443 3411. An ON/OFF switch is included see image attached, I can't quite see the switch end in Baytown's picture from post 659.
box.jpg

Hi Tankmat, fellas;

Ok, I’m an idiot. I did such a good job of installing the trailer module that I forgot that I installed d the on/off switch!

I looked at Tankmats’ photo, then back tracked my wiring and saw that I had indeed installed the switch. I just forgot about it.

I reinstalled, connected to the caravan, turned the indicators on, and Lo and behold, a flashing trailer icon on the dash, so I’m all set.

Thanks again folks for the assistance.

A very embarrassed Ken🙄
E24890B4-E3DE-488A-995E-53AC4A9C8F04.jpg