test it with a test lamp to see witch is liveperm & ingnition live, nutal also nutral its pritty simple with a test lead but you shouldunt need to chopp the vans wireing loom you can by adaptor leads from halfords even if you by one and chopp that about to avoid chopping wiring looom of van it will tell you on the back of the packet of the adapter what wire does what
kevin, March 2009