I believe that there is a different voltage required for the (RUN/CRANK) SMALL RED WIRE versus the LARGE RED WIRE. I am pretty sure that the LRW has to have a minimum of 12v when the SRW has voltage going thru it.
I should have clarified but I am asking about the SRW minimum voltage for CRANK.

Then I believe that there "might" be a difference in voltages between the boxes (-5,-6,-7 etc.) too.

Thanks for the reply.

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)