15Amps thru a Nason switch. Fireworks come to my mind first. Somebody messed up if this is a common problem. Lucky for us, I have extra hammers (and wire crimps)..
Extra hammer averted. I moved the fuel pressure switch circuit to between the start switch & 1st solenoid (new 10 AWG wires). Worked fine even with extended cranking. I just cut one of original FP switch 6 AWG leads shorter and connected it to the solenoid on the starter.
That is where it should be. You need to contact our adopted son, Elon, and offer to help on his big Texas rockets now.