the man in the van felt guarding his possessions by installing an alarm in the van would be the right move. Someone had already patched into the wires and set up an alarm but the actual siren and the brain box were dead on arrival. So TMIV bought the exact same alarm system and swapped out the brain and the antennae and a few other wires...and it actually worked. He left the old siren so maybe someone would cut it thinking it's going to disable the alarm and then used the new alarm and put it in the cabin. Of course, if someone really wanted to steal the van they would just take it with the alarm blaring and disconnect the battery once it was started. Please don't!