invest in a $5 multi meter if you don't have one already. Or even a test light.
I don't have first hand experience with the rear tow harness, but basic procedure would be something along the lines of :
Stick black multimeter probe on an earth point (any raw metal surface on the car which attaches to the vehicle body or chassis), and the other end on the connector harness.
Look for a signal that shows 0 volts when the engine is keyed off, but goes to 12V (most likely 12.8 ish volts) when it's keyed ON. This is your ignition switched 12V supply, and should be suitably fused in the vehicle's fuse box.
For the reverse power source, same deal as above, but leave vehicle keyed on, and move gearbox to reverse to see the voltage change.
There are wiring diagrams available for our cars, but with some searching around here and some testing / thinking, you'll get it done easy.
-Mitch
'El Burro' 2012 Defender 90.
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