Morning all,
Thought i would post up some photo's i have for the new D4 Electric trailer brakes.
The wiring has changed in the Discovery 4 which is a good thing as it is easier to wire.
Now lets begin & hopefully it will be clear for all to follow.
Trailer Plug info(7 Pin Plug):- Australian Regs:-
Pin1 Yellow Left Indicator
Pin2 Black Reverse/Auxilary
Pin3 White Earth
Pin4 Green Right Indicator
Pin5 Blue Electric trailer brakes/Auxilary
Pin6 Red Brakes
Pin7 Brown Tail lights
As per usual 4 wires:-
Black +ve direct to battery via Circuit Breaker.
White -ve direct to battery/battery post.
Red Connection to brake light wire in trailer loom.
Blue Connection to Pin No. 5 on Black trailer plug socket.
You will need to run Black & White wire to the front of the vehicle & the Red & Blue wire to the rear of the vehicle under the L/H/S tail light.
All 4 wires will run from the position you decide to place your Electric trailer brake unit. (normally at the L/H top edge of the panel under the steering wheel).
When removing this panel just grab the top section & pull in an arc downward, if you brake, lose the clips the part number is FYC500040.
In this photo below i have had to find the splice joint in the wiring loom for the park light circuit (all European vehicles run a left & a right park light circuit in there vehicle wiring loom)
It is basically one wire feeding 2 Pin outs. (Pin 7 is our park light circuit & Pin 5 is our supply for our Electric trailer brake varying voltge).
Remove the L/H/R tail light assembly by undoing the 2 phillips head screws & then prising the light gentry from the body with a flat blade & cloth inserted between them so as not to scratch the paint work.
Cut away the black tape on the loom that goes down to the bottom connector, you will come across the splice joint (brown cable with glue coming out on connection-you will notice it starts as a black wire only & after this splice joint it will have a brown & black coming out). The black wire goes to Pin no. 7 & is your park light wire, the brown wire is the other park light wire that we do not need & connect the blue wire to for your trailer brakes. Cut wire as close to splice as possible, tape splice joint up & connect your blue wire to the brown wire that now goes to the plug in the wiring loom.
What we have done is basically supply the cut brown wire the varying voltage for your trailer brakes via the blue wire we have run.
The red wire just connects to the red wire in the same loom that goes to the bottom plug, this is the brake light wire pick up.
In this photo you can just make out the 2 connections & the cut of the brown wire.
The photo above just shows the exit point on the firewall (rubber grommet) that i passed the cable through. This is on the drivers side brake booster compartment.
Below shows how i cable tied up nice & neatly the Black & White wire to connect directly to the battery via a Circuit breaker & Earth post next to the Main battery box.
On the new vehicles there is no 2nd fuse box in the rear nor the need for the Diode.
Cheers all.
p.s. sorry for the poor quality images, from my phone. Will hopefully get better pics when i can.
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