The factory did it at the ballast resistor. A wire from the starter relay goes over to the output side of the ballast resistor to give it 12V while cranking, then when crank is released, the 12V from the ignition switch goes through the ballast resistor. I could fix it for you, but you're a little far away. I absolutely hate pushbutton start on an old car. Just my ocd kicking in.
Keep in mind, that I have no ballast resistor or starter relay on the firewall & that wiring has been eliminated. To start the engine, I have to turn the ignition on and simply hit a push button that's mounted on the underside of the dash to engage the starter. You can look at the hidden starter button as a theft deterrent.