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I did the same thing you are on my 740. Do not just use the wires from the alarm straight to the motor. They are probably not designed to power the motor. I had two wires like you described, and a third +12v source from the alarm. I used the +12v to power the relays and door lock motor and eventually it blew the circuit (took a week or two). I'd recommend to only power relays with the two wires you have for your alarm and borrow +12v from somewhere else like the ignition harness... (that's what I did, other's might say that's a bad idea, not sure)
-Nathan
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