where have i gone wrong i have made one up as per the intrustions given here
http://www.volvoforums.org.uk/showthread.php?t=46943

however when the wire is inserted into port 16 and port 3 with the ingintion off the led is not lit the only way i can get the led to light is by putting the 3rd wire into port 5 and then its just on all the time even with the igintion on so where am i going wrong somebody please help.