Door Sensor can't pick up Passenger side

HI, I have the clifford rs3 responder in a 240sx '97 and i'm having trouble trying to have the passenger side door set off the door sensor. I did a check and the door is negative, but the wierd thing is when open AND close the door the connection remains negative. I think i'm doing something wrong. I tried a combination of things but still can't get it to set off my alarm. Do i need to purchase a relay or some sort? I'm not understanding what's going on because the 12 volt detector i have (the light in the screwdriver kind) remains lit when i connect one side to the dome light. Very perplexed... Any feedback will be great. Tahxn!

What door trigger did you use? You should use the RED / white wire in the drivers kick panel.With a torch and a big enough hammer...it WILL friggin fit!!