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If you owned a 2019 Ranger with a blower motor issue, you’d probably take it to the dealer for the recall.Johncrofton, hope you have the issue solved. As said above, the resistor is screwed into the blower housing, passenger side under the hood. Pretty sure it's the same on all years, at least 1993-2011. Sgtsandman mentioned above corrosion on connections. Be certain to get a new pigtail connection and splice.
It looks like a one minute repair. Just remove a screw (7mm?) and plastic wire connector. Nope... in most cases the resistor and wire connector are welded together by corrosion. Had to do it on my '99 years ago and my '10 recently. Soldered and heat shrinked (best way) years back. Getting lazier and butt spliced last time. Either way, simple and inexpensive.
If I had a 2019 + Ranger with the same problem my head would explode thinking about the possibility of needing a new control unit and diagnostics to tell me it'll only cost 900 bucks...bad dream