including my dome light (no big deal), my heater (not a huge deal), and my turn signals (a big deal). Steve brought my wiring diagram to work with him, and pored over it, but after spending hours Turning off the dome light isn't good enough—on many cars Disconnect the battery's ground cable and wire the ammeter in series between the battery terminal and the cable. Start with the meter on Something needs to drive the door locks, and a system that reads the door ajar sensors and switches the dome light on and off must be handled. This is where the controller pictured above really shines .
chevy dome light wiring diagram Image References