I was looking in to a similar device to put on the power window circuit. My goal was to use the high current condition of the window motor when it reaches the end of travel to cut the circuit. Kind of like a self resetting (with time delay) circuit breaker. I imagine a similar device can be used on the door lock system as well. It would be simple to make such a device, but I have some leads on products that already exist that do this. Walter wrote: <SNIP> > What do y'all think about designing a new door lock module that senses > current draw to test the state of the door locks? This would give me the > feed-back loop that I'm looking for without adding new wires in the door.