I have moved to a full American Autowire retrofit harness, so I am not certain on your stock '75 harness, but I suggest looking at the electric choke wire, and the excite wire for the alternator..
None of this is applicable, please re-read my post. There are only two lines off the ignition switch (actually three
They are:
ACCessory: Goes cold during cranking and of course hot in both "run" and "accessory"
"IGNITION RUN" or IGN1 This is the ONE wire which supplies such items as ignition, VR IGN terminal (power and sense) and alternator field. It supples electric choke if used, and other smog doo dads. IT IS NOT POWERED during "start" (cranking)
"Bypass" or IGN2 This wire only goes one place........from the ignition switch IGN2 terminal to the coil+ side of the ballast. It is hot ONLY in starting
To repeat the ONLY way to get power BOTH in "run" and in "start" is to either wire the above two together........or use isolation/ steering diodes to operate a relay
You can talk all you want but the "headwaters"---the source---is the ignition switch.
