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Home >> GMC >> 1993 >> C3500 HD 7.4 N, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Testing >> Front System >> Wipers Run At Low Speed Only

Wipers Run At Low Speed Only

  1. Disconnect wiper motor connector. Turn ignition to ACC position and wiper switch to HI position. Connect test light between ground and Purple wire terminal of wiper motor connector. See Figure . If test light comes on, replace wiper motor (replace delay module on pulse system).
  2. If test light does not come on, connect test light between ground and Purple wire terminal of wiper switch connector. If test light does not come on, replace wiper switch. If test light comes on, repair open in Purple wire between wiper switch and wiper motor.