I need 12v

67Dart273 said
I messed up slightly. The diode will have to feed all ignition loads during start. So you need to determine what the IGN/ EFI load is and size the diode appropriately.

Only way to isolate the EFI would be to use two diodes, "steering" they are sometimes called.

I did not disconnect the either of the ignition 1 or 2 wires from the connector, so that should feed everything as normal. If I just put that diode on the jumper (the pink wires in the pic is the jumper) so that current cannot cross over to ign 2 during normal running operations