Wiring a 13 pin Euro plug - UK-Trailer-Parts Dec 04, 200913 pin trailer & caravan plug & socket wiring. The 13 pin Euro type plug and socket is now fitted on most caravans to supply power and all the road lights. 13 pin trailer & caravan plug & socket wiring is not too difficult as the first 7 pins follow the old 12N (āNā type) wiring with 5 additional wires for reverse, a switched and a live power supply. TOYOTA COROLLA 2002 REPAIR MANUAL SUPPLEMENT Pdf COROLLA Electrical Wiring Diagram Supplement (Aug., 2004) S. COROLLA New Car Featurer Supplement (May, 2004) Page 13 BACK TO CHAPTER INDEX To Alphabetical Index TOYOTA COROLLA REPAIR MANUAL SUPP 04 DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting Euro -- OBD (On -- Board Diagnostic) ve - hicle, an intelligent tester ll or OBD