Fuel pump & coils, injector switch (kill switch)

[Dan Bloomfield]

If I have a switch between the relay and aux output as pictured, mainly used to immobilise fuel pump & coils/injectors using a factory unused dash switch with duel input/output

will I need to enable a pull up resistor due to lowside switching, if available on aux channel. Or will I need to use a digital channel insteed.. Xtreme+ 

 

[Vaughan]

Wouldn't it be simpler to wire the switch into the ECU as a DI and then set it as antitheft or Stop Switch? This way the ECU wouldn't inject any fuel or trigger any spark when the switch is set to its disable position.

[Adamw]

And your switch will work fine as drawn.