[j12piprius]

I could try running my kill switch to a different ground, and see if the injectors still work, as long as that wouldn't hurt anything. If the injectors still work. then the positive side of the wire controls the injectors, and a different positive will be needed for the led light and the switch.

If the injectors don't work with a different ground, then the positive can be used for all three, and the grounds will need to be different, which should probably be the case anyway. In lieu of any warnings, I'll look for a ground and try this, before hooking up the wires to the 5 pin relay.