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Message: <blockquote data-quote="ttocs" data-source="post: 932367" data-attributes="member: 11896">well then do some reading up on 5-wire-reversing polarity doorlock systems.  It is probably the most difficult system to integrate into and what our mustangs use.  You will have to first find the correct wires, but then also diagnose the master/slave switch, wire the relays and then insert them correctly or you will blow the door lock circuit.  Security is honestly 3-4 steps above installinstalling a deck and some speakers.  It requires not only more technical knowledge(better know relays upside down for example) but also different techniques to diagnose the correct wires.  The final reason to take it to a pro is because a great alarm with a bad install in the best case will just leave you with out your stereo wondering why the alarm didn't go off, worst case is that it could strand you somewhere needed a tow....</blockquote>