ford super duty 2008 door triggers

I have a 2008 Ford F-250 Super Duty.

Here's the deal, I have found all of the individual door triggers, they rest at ground then go to open circuit when the doors are open.

I however cannot get the alarm to trigger (using a Matrix 12.5, the pos. door trigger input) when all inputs are combined. The alarm will trigger when an individual trigger is connected. I have tried diode isolating and that still leaves me not working.

Bascially I need to know how to combine all the triggers and have it work.

Thanks!! 

the thing is, the ford door trigger output is not enough to trigger the alarm. this is the diagram i use and it works for me. have only done one of these badboys. follow link, DIAGRAM is from scytek..

http://www.4shared.com/file/32088025/ff72619c/Ford_Superduty_F250_2008.html

Thank you for the response. The link you provided didn't allow to me download the pdf. I wound up using the dome light wire ( I think). It was a grey / YELLOW wire in the passenger A-pillar.