Easier solution: take off one highly visible trim piece from the dashboard or console of your car, and throw a $20 DMM on the passenger seat. A couple random bi

Easier solution: take off one highly visible trim piece from the dashboard or console of your car, and throw a $20 DMM on the passenger seat. A couple random bits of loose wire in various colors for effect, maybe a half roll of electrical tape, and nobody's going to take a second look. Source: nobody has ever stolen any of the cars I've owned while I've been troubleshooting the ongoing electrical problems.