Ignition woes

Thanks for all your help. I'm still learning. It's unusual to see someone give of their knowledge in the ways you have. I bought a shotgun, having never used one. It took me a while to understand how it operates 'mine,' and it's taking me time to grasp these concepts- current flow is needed to measure voltage drop, which varies with the current, what is a short, and backfeeding, for example.
Even though my short(s) is not fixed, I plan to leave the 3 fuses out, hook up my ignition switches at the bottom of the steering wheel and check out cranking voltage at the coil, and check the total voltage drop at the + coil in run and when cranking.