Hi I am looking to install a viper 3305V 2way alarm and am having some trouble locating the door triger (-) grn/rd wire i checked and there are two wires that are the same so im confused as to which i need to cut

 

You don't cut that wire, your door trigger wire just needs to tag into the door trigger wire. How are you testing the wires?

 

I'm just going off the wiring diagram I am trying to figure out what wire i would need It's my fist install so I am just try to get as much info before starting