I have a 4 wheeler that i converted from a mechanical locking differential to an electric one. the mechanical one had a 2 wire spring loaded switch that as the mechanism rotated it pushed the pin in and closed the circuit and the 4WD light comes on.
Now that i have converted it to electric differential, there's no where for that sensor/switch to go. instead it has an electric plug on it and i isolated 2 wires that indicate if is in 2WD or 4WD. in 2WD it is closed on those 2 wires, in 4WD it is open.
It would be easy if it were closed when in 4WD .. i could just hook the light sensor/switch wires to it. but it's not.
How can i sense if a circuit is open on 2 wires and if so, close a circuit on another 2 wires?
assume i know how to use a multimeter and how to solder... that's about it. :)
Thanks for any help.