WOW!! Lol...anyways...you say you want to hook up the 4th button to activate the neons under the car..That is some creative thinking man.
Damn...if I was there, I would do that thing for you...Ok...
If you are really really really intrested in doing this then let me know...E-mail me at
UNISH25@yahoo.com.
I will need schematics of your alarm, model number, and serial number, company that made it etc.... Scan it and e-mail it to me or post it over here..I will need every circuit schematic they gave you.
You have to find out which wire on the alarm system the 4th button activates first by looking at the circuit schematic of the alarm.