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No, the voltage at the fans appears to be the one measurement which is missing from that thread. If you have a multimeter you could try measuring the dropping resistor's value - the result won't be accurate but you could check and see if you get a reading which is broadly in line with Searcherrr's reading of around 0.3 ohms or less.

If you do that, then before measuring the resistor, touch the meter's probes to each other and note the value - typically around 0.3 ohms. Then measure the resistor, and subtract the probes' resistance from the obtained reading.