7 pin socket reverse light

[Ryan in Melb]

I have been trying to solve a problem on my CX9. I have not been able to get the reverse lights via the 7pin socket next to the tow bar. I can’t get any voltage on the black wire. (Standard Australian trailer wiring).

I have traced the wire back to where the tow bar harness plugs in, inside the left rear wheel arch cover. Here I can see that there is a black wire that is un-terminated in the loom. It’s end is taped up in the factory wiring. You can see it next to my thumb. Photos of the part number is included as well. It’s right next to the 8 pin plug that connects to the rest of the body loom.

 

[Ryan in Melb]

Here is a link that shows the Australian 7 pin plug wiring.

Technical Guides Australian Trailer Plug and Socket Wiring Diagrams

Australian Trailer Plug and Socket Wiring Diagrams - Technical Guides Australian Trailer Plug and Socket Wiring Diagrams

www.trailersrus.com.au

 

[Ryan in Melb]

https://www.mazdaforum.com/forum/attachments/mazda-cx-9-50/3608d1497180482-2014-cx9-trailer-hitch-install-tc11actwh-trailer-wiring-harness.pdf

That’s the instal instructions for the wiring kit. Not sure if this is specific to my kit or not, but it makes no mention of the reverse wire needing to be connected.

 

[MGMGT16]

All the trailers and other accessories I throw on a hitch have a 7 pin connector and the only tow wiring we can get in the US is a 4 pin. I have it sitting in my garage waiting to get installed because I don’t want to have to run the other 3 pins manually. If I’m reading those installation instructions correctly, you have an existing wiring harness run to the back that you just plug into?

 

[Ryan in Melb]

Yes, it’s a factory Mazda 7 pin plug and harness