Ignition switch wiring 5.0 conversion

[Broncosuds]

I have a 1974 Bronco that has a 1994 5.0 conversion. The previous owner had the two wires from the Electronic Control Unit that need power wired to a manual switch that has to be turned on before starting the engine. They need to be wired to a source that provides 12v during cranking as well as key on. I’d like to eliminate that switch. Can anyone tell me what wire I could splice them into to provide power during cranking and key on? I’ve looked at the diagrams, but I’m not sure. Thanks!!

 

[Broncobowsher]

The ignition wire at the ignition switch. This is on in run, and sometimes in start. Some people have great luck and it works for them, others it never works. But to make sure it does work, splice the "I" wire off the starter solenoid in. This wire is the factory fix for the ignition not being hot in start. The original design is for a ballast resistor bypass, a boost in spark for starting. Now you use it for a "hot in start" to supplement "hot in run"

 

[Broncosuds]

Thank you! I will test the I wire off the ignition switch and see if that will work. I appreciate your explanation!