1984 Ford Bronco Viper alarm system Bronco turns over and t

I'm thinking about buying a 84 bronco it is in beautiful cond. For $900.00 the only one problem with it. It has an after market viper alarm system on it where your supposed to be able to start the truck remotely but it doesn't! Infact it won't start at all even after by passing the alarm system or even completely removing the system. The truck will turn over but still will not start. Did the alarm system burn something out like a fusuble link to something in the ignition system? Do I have to replace the whole wiring harness or what? Not sure where to start and I hate wirering and electrical problems and usually would stay away from buying a vehicle with any kind of electrical issues! But if you saw the condition of this of this 84 bronco. Man it is cherry inside and out. Help! Buy it or not?