Thread: D3 Electric Trailer brake wired-photo

This is only for the Discovery 3, Search the forum & there is one specifically for the Discovery 4. The later photo's in that thread are better than the first ones.

Cheers.

p.s. there are no fuses, thats why you cant find em'

Thanks sniegy, done this today and it worked a treat.

Mate,

It looks as though the fuses are up side down in relation to the colour of the wires. The 2x 5 amp fuses (orange) should be at the bottom with the brown and black wire joined together...

Thanks for the assistance though. I was stuck untill I saw this write up.

So if a trailer with electric trailer brakes fitted was plugged in to a LD3 the brakes would be applied when the parkers were turned on. Is that right? It can't be, but I can't see it any other way at the moment.

Tiojeffe.

This could happen if the brown wire is not cut!
If the lights are set on auto & a trailer is attached with electric trailer brakes & you travel under a bridge for instance.
If the modification is not done, then power is fed to pin 5 & the brakes are applied at full voltage.

That is one smoking hot trailer!!!!

Sent from my iPad using Forum Runner

Thought so. I followed the instructions and they were spot on. I ran a power feed from the main battery with a circuit breaker there. I think from looking at the fuses the batt feed to the white trailer plug is 30 amps so that could be used instead I believe. Also my Parkers on the trailer did not work until I did the electric trailer brake controller install... Very weird.

Thats pretty much how i wire them and i also work for a dealer, only thing i have changed recently is i now wire as close to the back of the trailer plug as poss into pin 5, the reason for this is after monitoring the amps drawn on the trailer brake circuit on my own d4 set up it consistantly drew 23-26 amps, this was with a twin axle caravan, 4 magnet system. and was coming back down the toowoomba ranges. so the system was getting a work out. just feel the original wiring to pin 5 from splice at tail light is a bit light on for full load. mostones i fit get anderson plugs at same time so i usually whip the rear bumper off anyway to keep things neat. hope this is helpful

Any chance of pics of where you now join the wire ?

I have just found that my D4 turns off the front park assist when a trailer even though the parking on/off switch is lite. Has anyone got any ideas as it would have thought that the trailer connection would have only turned off the rear sensors.
Des