1994 Chevy Z-71 door lock problems

I am installing a K-9 alarm unit on a relative's 1994 Chevy Z-71.  The unit has keyless entry function on it also, just 2 wires that send negative (-) pulses.  This truck has the 5-wire reverse polarity (rest on ground)  type door locks.  I have looked everywhere at diagrams to wire this using 2 relays, and they are all the same.  I wired it exactly like the diagram and double and triple checked my wiring and everything matched, but every time I put a fuse in on my +12V wire, it blows the second that it touches both terminals.  Anybody know what I may be doing wrong.  Also, I did not purchase the relays, my friend did, and they look like the right relays, but the center pin does not say 87a, the top and center pin both say 87 but I've never seen one that didnt have an "always on" pin.  I assumed the center pin was the "A".  Is this right or do I have the wrong relays.  One last thing, I do not have a have a harness for the relay to plug to, so I just hooked female blade terminals to the wires and hooked them to the relay that way.  Is that OK? or do I need the relay harness?  PLEASE HELP!!! THANKS!