Got all new alarm system, now to install...
 

I received my pager alarm system. It is VERY small, but cool looking. I have another alarm (used) that I'm installing first, but with no instructions. I've figured out a few things, I've got the ground wires, battery wire, siren, and door sensors. But after that I have no idea. Heres a few questions I need answers to:
(this is an older 1992 Alpine alarm system)

What are brown wires usually?

White wires that are not sensors? parking light flashers?

brown is usually siren.... white is usually parking light

Okay, I installed the alpine alarm, and it works great. Still don't know what some of the wires are, but I'll just have to test them. Now I have another problem:

I HAVE NO IDEA HOW THE PAGER THING WORKS!

The instructions sound like they were written by a two year old, and I dont understand these pinouts. They are like:

green = door sensor (+)
purple = door sensor (-)
gray = trunk pin (-)

Wtf is this negative business??!!, do they want me to ground the negative? That wouldn't make any sense, how would the trunk work? I tried putting all the sensor wires together with my other alarm, and it just goes off with the doors closed. I don't get it! help!

I would think that the "-" means when the switch is closed it provides a ground

you use one or the other not both door triggers, i believe your civic uses a negative pulse