Apologies
@Bobineos, I missed this.
For my specific configuration I needed to get a single 2.5mm wire from my electric brake controller (mounted under the steering column) to my camper trailer plug to operate the electric brakes (service brakes). The 13 pin Euro standard is supposed to follow ISO 11446 but Ineos generously didn't bother with either the pin count or the colour code.
I ran a wire into some glue lined heat shrink then some abrasion resistant nylon sleeving. I fed that through a hole I made in the exit grommet in the right rear inner guard. I followed and tied off to the existing trailer harness and entered the waterproof gland on the back of the 13 pin Euro socket. To get access to the trailer harness I had to remove the right rear wheel flare, the plastic inner guard, the rear protection plate and lower the rear edge of the muffler heat shield. I also needed to disassemble the 13 pin Euro socket to get access to the pins.
Because I didn't have any spare pins at the time I cut and removed pin 8 (reverse) as a donor pin and inserted it in vacant position 12 (service brake) I terminated the added wire to this pin. My camper does not have reversing lights. I now have a spare pin so will reinstate pin 8 at some point.
My camper uses an Australian standard 7 pin flat plug. The 7 pin standard uses pin 5 for the service brakes. I used a 13 pin Euro to 7 pin adapter and made sure I had a service brake signal at pin 5 at the 7 pin end. All this to create a circuit to pin 12 that should be present from manufacture.
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