windshield wipers only have off and slow no hi

by Greg
(Rochester,Mn. usa)

Bought the car, first time I tried wipers I slid switch to low they came on I thought wow that's slow. tried hi and nothing changed-same speed. was going to replace motor then auto parts guy said could be other things like a relay. there's a row of 3 wires going to motor and a single wire by itself. I quick checked with meter the single wire is .583vdc no matter and no matter where I put switch only middle wire has 12volts. if it has a relay I don't know where it is. I see nothing that supports the idea of intermit wipers. I thought if I moved switch to hi at least another wire would come to life. I read some years have circuit board? i'm lost

Chris Trautman @ Corvette Assembly Plant 2019

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