Camping/Reverse lights

[Skitzyrex]

ROFL... dunno about that... I've been wrong more often than right lately...

So using the below diagram
Reverse lights - 3 Way Switch in Rear.jpg

and the following for the switch
4 - Reverse wire from oem reverse lights
5 - Earth Being Common to both
6 - 12v from aux battery

The fuse blew straight away when turning on, so I must of done something wrong.