no need to use relays...

wire the actuator in PARRALEL with the one in the rear door (you can pick up the cables in the sills...

the actuator doesnt even connect to the alarm!

the alarm outputs should have 1 that goes negative on lock, and one that goes negative on unlock...you wire these into the RETURN wires from the keylock switch in the drivers door...voila!

(most alarms can suppply up to about 300ma on those cables, the keylock return sinks about 100ma - according to my meter) so no burn out!

also only two cores to feed into the door...which you can do with the aid of a zip tie, a pair of wire cutters, electrical tape and washing up liquid....but the boble offthe end of the zip tie, tape cable to end of it securely (thicker end where bolble was wrappingthe tape round so the wire is completely covered) apply washing up liquid to other end of zip tie - now use it like needle to thread thru the rubber boot on the door (hint going from the inside of the car into the door seems easier to me)...should take about 5 mins tops...oh if th cable is thick run a lead cable thats thinner using the above method, then use that to pull thru the main cable....