I've got a quick question regarding the old Williams EM flipper coils, namely the FL-21-375/28-400. I'm tinkering around with some old EM parts in my pinball projects and I was surprised about the kick of those coils. I measured the resistance of the first and second circuit and they came out as 0.5 and 8.2 ohm respectively.

While the 8 ohm value is close the one described on the coil resistance chart homepage (https://www.flippers.com/coil-resistance.html), 0.5 for the first circuit is way too low, it should be 1.5.

I tested both flipper coils and they have exactly the same values, so I don't think it's some kind of damage that happened to the coils. Has anybody ever measured their FL-21-375/28-400 coils ? I can't run them with a normal power supply since they will draw around 40 amps ! (amps = volts / ohms).

My idea is to put an additional 1 ohm in line with the coil somehow, however I don't think this is the way they worked in the original machines?

The problem is that
a) the flipper is too powerful, the ball is bouncing off targets that are halfway up the playfield.
b) the power supply shuts down momentarily since it can only provide 15 amps.