I just got my #8 yesterday. I am confused on measuring the voltage drop. I check my battery with my multimeter and it came in at 4.0v, I then put the battery in the #8, hit the fire button and it still showed a 4.0v. Am I not checking the drop correctly?
Typically people test at the positive screw and negative screw at the coil while firing. Is this what you did? BTW The resistance of the coil effects voltage drop and coils with different levels of resistance will read different voltage drops.