On Monday, July 20, 2020 at 7:58:24 PM UTC-4, Dave Nadler wrote:
On Monday, July 20, 2020 at 3:54:04 PM UTC-4, wrote:
Now, when cranking, battery voltage drops from 12.7 to 10.5
but on starter terminals I measured 7.5 Volts.

Lucas, 3v is still a pretty huge drop!
Keep looking!

OTH, if its really 50A steady state (at 7.5v that's .5hp!),
3V = 50A * .06 ohm
So system resistance is not crazy...