1999 Buick Riviera 6 cyl Front Wheel Drive Automatic 91000 miles
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Wipers only work in wash mode. Any ideas?

First check all the fuses, just in case. If OK then check for power at wiper motor connector with ign. on and wiper switch on. If no voltage, then the switch is bad.

I was afraid of that, only one wire hot at motor...no voltage on yellow or purple. I think they are high and low.

Switch is very expensive, entire turn signal lever.....wanted to be sure before I ordered. Thanks