G'day, here are some photos of the trailer ECU, the wiring order for 7 pin flat plug and the three different sorts of harness' that are available. Mine is the 000030.
The larger of the two plugs (black) goes into the top of the trailer ECU and the smaller one (white) goes into the white one in the back right of the boot.
You need to mount it upside down so that the black plug doesn't snag the wires.
Hope this helps.
Cheers
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