As I understand it Landrovers have trailer wiring in accordance with European specs and not Aust Specs - I believe the second socket is North American Specs. You will also find that each tail light has its own power supply and one of these wires is the same colour as electric brakes for trailers so can cause issues.
There is plenty on the issues in the D3/D4/RRS section as they same issues crop up there - do a search there and all should be explained.
Cheers
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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