Well you learn something every day. Seven pin plug for the vehicle.

DMH122

Yep I found out they did that as well, but didn't want to confuse myself. lol

I saw the diagram for that and the wire that goes from one pin to another I will have to run to one of the outside slots.

I am just happy to find what I needed after only an hour or so of looking.

Mark

When the bloke at the trailer shop told me about led's etc I thought he was pulling my leg to start with, but as I said earlier I had the plug in my hand and turned on the lights and blinkers and I had no indicators or lights.

I put the 2 wires back in without the 7 standard wires and bingo I had lights and indicators.

It affects late model cars with led lights. My Dmax is a cab chassis fitted with a Pod that has led lights. The plug actually came with wiring harness on the vehicle.

BooBoo
That explains the difference then and why mine was not affected, as the styleside has std bulbs
My plug was also supplied factory fitted.
There you go, now I know!!

cheers

G'day Boo Boo
Is yours a genuine Dmax Towbar or one supplied by HR or other variety?
Under the back of your vehicle there should be two relays which click when you activate the central locking.
These swith on when ever there is a flasher signal come down either the Lh or Rh flasher. Both click when locking activated. It is the output of the relays which go to the Lh flasher, pin 1 and Rh flasher, pin 4 wires in the plug base on the tow bar.

If you have either of the mentioned side wires connected to the trailer electrics then something is wrong with your connections somewhere.
The two side wires, one goes to the earth wire of the plug base and the other end/side wire is designed to come from the black, to be earthed, wire of a reverse camera or sensor system.
So apart from the trailer system and the reverse sensor system having ot use the same earth wire in the plug base, this wire going to chassis earth, there should be no connection with the trailer wiring whatsoever.

Exactly which lights do you not have when the plug is in or out? Confused here.

From what I can work out regarding your lights the side wires are somehow connected to the trailer feed wires in the plug base.

As mentioned before, only one of the side wires is connected to earth, the common chassis earth and the other wire has nothing to do with trailer wiring.

Inside the plug base is a tiny reed switch which is designed only for very small milliamp flows. If somehow your supply or trailer earthing is going through this minute little switch it won't last long and the lights will again not work.

G'day Ross

Well it's finally making a bit of sense.

Yes it is a dmax plug, not an after market job.

I now understand what your saying.

Now for the lights confusion. When I take the socket that is wired to the car off the car I then loose the lights and indicators from the back of the car, not the trailer.

However, when I put the socket back on the wiring on the car everything on the back of the car works againwork again.

Communication is a wonderful thing. If we could get it right every time we could make billions teaching others how to do it. LOL

G'day Boo Boo
I don't want to repeat myself but it is important we are all talking the same thing.
I know you can handle this, just to be clear

The Brake signal goes to 6
The Park lights go to 7
Earth to 3

LH flasher from relay out 1
RH flasher from relay out 4

The others are electric brake and + trailer supply as you know.
The bit screwed to the towbar is the 7 pin socket
The bit on the trailer wire to connect to the vehicle is the plug.

If you unwire the socket from the vehicle but or unblot it from the vehcile then it seems the earth of all your rear lights is also earthing at the earth of the trailer plug. Interupt the trailer earth and you interupt the earth to these lights.

Who wired this thing? The earth of the vehicle lights should be autonomous and not dependent on the trailer plug in any way.

If the vehcile lights only work when the plug is in the socket and trailer is connected to the vehicle it would indicate the earth for the rear vehicle lights are earthing through the ball and there is no effective earth at the trailer base socket.
Check this out it's there somewhere.
I hope this makes sense. Yes teaching vehicle electrical is what I have done in the past.
Regards

Ross M

G'day Ross

Sorry about the delayed reply, but I have been getting a house ready for sale and the Dmax and caravan ready to go to St George Qld. We arrived today.

Ok I think I see the problem.

I had a look at my follow ups and see that I have mention the plug at one stage.

My problem was only with the socket screwed to the towbar. The trailer was never attached to the socket.

All the wiring to the socket (female) screwed to the car are in the right holes.
It was when I removed the socket from the car that I had no lights etc.

Anyway they are now working OK.

Thanks for your patience with me and the detailed explainations.

It is good you got it working but it does indicate the fact that the earth of the rear lights is dependent on the earth of the trailer 7 pin base instead of there being a definite original earth and an additional earth for the trailer base.

It would indicate the installer of the towbar doesn't really follow sound wiring practices.

Regards

Ross M

G'day Ross

Based on your last Post I am going to drop into a Dmax dealer when I get home.