Skip to main content
3 of 7
Fixed error in logic.
Transistor
  • 180.4k
  • 14
  • 194
  • 417

I don't think you can do quite what you specified with only one relay.

If you are prepared to modify your requirements so that the circuit is reset when the ignition is turned off (rather than off and back on again) then the solution is simple.

schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. An extra contact solves the problem.

Transistor
  • 180.4k
  • 14
  • 194
  • 417