Did the wiring loom have a bypass relay in it?
Does the trailer connected buzzer sound when indicators are on?
Did you cut the indicator wires or just splice into them?

 

No bypass relay, no splicing, no buzzer.

I fitted a Renault specific towbar loom that plugs into the existing wiring

www.pfjones.co.uk/Wiring_instructions/19500513RC.pdf

 

I would give the company that supplied the harness a try 1st. I always thought you had to have a bypass relay installed on these.

 

Yes! I thought that's what you had done, but was just making sure!
I checked this type this morning and couldn't see any reason for it to go wrong, pretty simple.
My first thought was that the rear indicators are now acting as if they are the trailers and as there are no trailer lights connected the van thinks it only has front ones?
What are the two wires in the plug/socket with spade terminals on for, are they to tell when the plug is connected?
Maybe worth checking this again, in that the wires are in positions 1 & 2 ? if they where in maybe 2 & 3 it could work backwards?
Mine has the bypass relay!

 

I thought you had to have the buzzer, EU rules and all that nonsense!

 

Thanks. Contacting the supplier is my next course. There looks like a plastic spring clip in the socket that does something to the contact
of those two seperate brown wires, maybe that is dicky? I think the rapid indicator flash is a conforming warning these days instead of a buzzer.

 

so you actually mean that the switch in the socket if faulty would think a trailer is attached but no indicator lights and then flash them fast, which is exactly what you have ?
If you've got time I'd try disconnecting the two brown wires in the socket and then try it, if no difference? try connecting them together.
Having a meter at this point would be good to work out whether it should be normally closed or open, but I'm sure you could work it out by putting the wires on the different terminals and trying it!

 

I will have another fiddle tomorrow

 

i hope you not do it in the front lawn lol

 

Fixed and tested. Swapped the extra brown and brown and white wires around. I think the destructions are a misprint as the diagram shows a lighter wire as brown but you'd think brown and white would be the lighter coloured wire? Anyway it now works. Thanks DKT1

 

Well done for persevering! Glad you got it sorted.