Thread: D4 trailer pin diagram

I’ve had a look thru the forum and can find lots of info on the D3 7 pin trailer plug but nothing on the D4. I’m lead to believe they are different so was hoping someone can point me in the right direction.

I’ve just picked up a new off-road camper (Cub) but had troubles with the Tekonsha P3 not detecting a trailer attached, I think the brake pin was the problem but the guys worked it out with a multimeter and had to rewrite the plug. I can’t seem to get max braking at the trailer wheels, very confusing as my previous caravan didn’t need the plug to be rewired. I plugged it in and all was well.

Can someone tell me which pin is the one the brake controller uses to apply current for the trailer brakes?

Many thanks,
Mike

Thanks, I have gone thru the link you provided. I’m pretty confident the controller is installed correctly as it was working fine on my previous trailer as stated in my original post.

Cub (my new camper) use the Narva standard which is different to what’s on the D4 plug so they had to change the wiring on the trailer plug.

I want to be sure they have the brake wire on the correct pin (pin 5) so just need to know which pin on the back of my D4 is pin 5, if there is a diagram with the pin assignments that I could use to confirm their wiring of the trailer plug it would solve my problems.