youtube is your friend.
https://www.google.com/search?q=dismantle+13+pin+caravan+plug&rlz=1CAWPBA_enGB844&oq=&gs_lcrp=EgZjaHJvbWUqCQgAEEUYOxjCAzIJCAAQRRg7GMIDMgkIARBFGDsYwgMyCQgCEEUYOxjCAzIJCAMQRRg7GMIDMgkIBBBFGDsYwgMyDAgFEC4YAxiPARjqAjIOCAYQABgDGEIYjwEY6gIyDggHEAAYAxhCGI8BGOoC0gEJMTU2N2owajE1qAIIsAIB&sourceid=chrome&ie=UTF-8#fpstate=ive&vld=cid:2bc88eae,vid:s4gkahSrL64,st:0
hope this helps.