Also possible the brushes are worn. when the fan is off, (switch on) and you go over a RR Track, does the fan come on sometimes? If so, I'd change the brushes. If you drive with the switch on, and the fan starts and stops randomly, it can be brushes, or PBU.

The controller is probably going bad (or is bad I guess), bad solder joints or connections or switches or something. The repeat turning on aspect might just be happenstance that it decides to work at some point.

Did you actually CHANGE YOUR FUSE?

--R

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