Glad to hear it’s fixed, thank you for the follow up! Keep it clean and drive it often!

 

The SS fan is variable speed, and does not follow the 219* rule.

 

Checking PWM signals with your average meter is a crap shoot. They are not really designed for that unless they have a frequency choice and then you should see the PWM frequency, better if it has PWM% or duty cycle. But if that's all you have try measuring both DC and AC voltage. In theory if you measure the AC voltage of the 12V battery, you should get zero, but if you measure the AC voltage of a PWM signal you may get something. If you watch it over time it should be zero till the fan turns on and then likely go from zero to some max and then back close to zero when the fan is on full. It's clearly meter dependent as AC volts is usually designed to only read 60 hz sine waves accurately. It's also possible that the DC reading will start at one end, zero or 12 and then move towards the other as the fan get's closer to max speed, but that movement may be very non linear, or very unrelated to fan speed. All depends on the meter's design. If it's really the kind of thing you want to be able to check look for a meter that has frequency, pulse width, PWM % or duty cycle. Looks like about $30 gets you all of that today.

Ira