Had same thing on a GM chassis. Had to replace the wiper motor assembly. There is a computer control board inside the motor assemble that went bad. It was an east fix, and not too expensive, around a hundred bucks as I recall..
Don't know what you have for a wiper system, If you can get a look at it, check NAPA for replacement parts..
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Back to a 5'er after 4 yrs fulltime.
Pulling with a '14 2500 ram, 6.4 Hemi.
Montana High Country 31RE
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