wipper speed 94 Cherokee

Check your power circuit, poor power feed or ground can cause slow wipers.
 
If the power circuit checks out, it might be worthwhile to open up the motor and check for dry bearings, especially in the output shaft. This can slow it down a good deal, and if your high speed is getting more like the low this could be the cause. I had this on my 87, and it was quite lively after a good relubing.
 
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