93 altima alarm door lock negative

hi, i hope this question hasn't been asked, or sounds so dumb as to get it deleted.
i have hooked up an autostart alarm that i got off ebay yesterday. everything went pretty well except for hooking up my door locks. i have installed a S-300R Sherwood autostart alarm.
everything i have read so far says my door locks are negative, but the wires to hook up to them are: 'normally closed 87a', 'common 30', and 'normally open 87a'. all these wires are by 2, and have door unlock, and door lock.
am i supposed to try and reverse the polarity of any of these wires? and which should i use?
i have found the 'door lock timer' and am very unsure of what to do. any help would be very much appreciated.
thank you

I am not familiar w/that alarm system, but you should have neggative triggers for the door locks. If you do-use those.
Power Lock is gray/blue    -   at door lock timer
Power Unlock is gray/red    -   at door lock timer Notes: Timer is a blk or grn box located right of fusebox behind a silver module or up high in the drivers kick behind a silver module, depending on model. Two plugs, white and black. The wires needed to control locks are in the black plug.

On relays that we use in this business, 87a is normally closed by default. It opens when the relay is energized w/+ & - on pins 85 & 86.
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Good Enough Isn't!

on those 87a shouldn't need to be used 87 will have to be grounded for both relays and 87 will be the outputs to your car which should be gray/blue for lock and gray/red for unlock.

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the customer is not always right

ok, so which do i ground? the normally closed 87a(x2), or the normally open 87a(x2)?

Thanks guys.
i connected the 2 'common 30' wires to the ground, and taped off the 2 '87a normally closed' wires. i then used the 2 '87 normally open' for my open and close.
Thanks again!