Constant to Momentary Output w/Ground?

Looking at this diagram,

its for a constant to momentary 12V positive output, well thats what I need but then its not, I have a constant negitive output from my RS unit while the truck is running off the RS unit, My factory alarm needs a Pulsed or Momentary Negitive input...

Problem:  Cant hook up a constant negitive output to a input that only needs a momentary negitive input.

Based on the diagram above how would I change that to make it work in my application?

the #30 terminal would hook to the factory alarm Disarm input (single pulse negitive)

the #87 terminal would hook to chassis ground

how would i wire the #85 and #86 terminals up to the RS unit that has a output of a constant negitive, would it simply be (looking at diagram above)  hooking the #86 terminal up to a constant positive and instead of grounding the #85 terminal after the diode, resistor, and capacitor, run that to the constant negitive from the RS unit, ... would that work, or would i have to change the direction of the diode, or put the capicitor and resistor on the positive side...  help me out please and let me know how to finish woring this, it would be greatly appreciated

bobby

Connect ground to terminal #87 where it shows connecting to a fused 12V+ in the diagram above, then connect terminal #30 to your alarm (-) disarm input.