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@S_K Yes I did get the fan working and successful trickle charges. To power the fan I used a 2A 12V PSU and a 5K bourns 8 turn POT. The fan needed more current than I expected, a 3A or 5A 12V adapter may be a better match.

SupraSPL said:

@S_K Yes I did get the fan working and successful trickle charges. To power the fan I used a 2A 12V PSU and a 5K bourns 8 turn POT. The fan needed more current than I expected, a 3A or 5A 12V adapter may be a better match.

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Thanks! I got impatient yesterday and tore into the car. Practice does indeed make perfect... seats out and panel off in under six minutes

I have a cheap 1 turn 25K pot... fine adjustments are tricky!

The nice thing about this fan is it seems to lack the typical start-up spike typical of motors. It's a very smooth and linear correlation between Amps and speed. I have a spare fan I used to take some measurements. With PWM shorted to ground, I could see 3.1A peak and 5mA current between PWM and ground.

I also discovered that with the fan powered by the car and the ignition on, shorting PWM to ground makes the fan run continuously w/o pulsing. I may use this for continuous fan running during AZ summers.

Thanks again for the feedback, and my apologies to everyone else for the OT post.

Good info ty sir!