adding a charging fault light

Mopar Tim said

67Dart273, im thinking it should be able to put a light on our mopars with some wiring changes, maybe a diode? Im drawing some diagrams that look like it will work. What do you think?
Edit: Im thinking a relay that will drop out when ALT stops charging, lighting the light.

Click to expand...

I realize you asked Del, but I have to think the relay won't do it on it's own because the battery would feed it anyway.
Maybe a voltage threshold type device, so ANY time the voltage was below say 13 volts it would trigger the light?
(adjustable voltage threshold would be nice)

The Arduino controllers could do this easily.