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I have a Lunar Quasar FB 2008 and all's fine and dandy till I connect the car up and then, but not all the time I blow the main 15amp power fuse losing all 12v power to the caravan.

I'm 100% sure the tow bar is wired up okay, (White Socket)

1 Yellow = Reversing light

2 Blue=  Live      (No Blue on caravan connection #2 is empty)

3 White = Earth

4 Green = Live

5 Brown= ???? Not sure will check tomorrow (Can't remember seeing brown on caravan plug think this was empty)

6 Red = Fridge

7 Black = Earth (No earth reading from caravan)

But the middle black wire in the grey plug doesn't show earth when tested with a multimeter touching the middle pin and the chassis, it doesn't make a circuit so where does this wire go to????

Black and white should both read as earth but only the white gives me a reading.

Black socket is fed by a seven way relay

White socket is fed from a power relay that came with the kit....