Very few SCs Cosme with a factory alarm, there is a bulb on the cluster but I don’t think it’s commonnas a factory option. What you typically see installed is the aftermarket or dealer installed ford one, which was probably made by Viper or the like. You need to find the box under the dash, and chase wires backwards the important one is the ignition switch cut, there will be a large red and green wire that the alarm has tied into, the wire was cut and it needs to be connected after removing the alarm. All of the other wires should just have been tapped to the factory stuff and just remove and tape the exposed factory wire.
All installations are different but most are sloppy because of time restraints.
I hope my problems go away it’s the only logical problem but don’t want to chance getting stranded the internal relay is likely going to fail or not provide enough juice from age to the starter. Plus things are restored to factory specs which is a plus.