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Home >> GMC >> 1966 >> I1500 Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Windshield Wipers - 1 & 2-Speed Electric -- Square Motor >> Testing & Trouble Shooting >> Washer (On Car) >> Washer Inoperative

Washer Inoperative

  1. Check the following: Sufficient solution in jar; hoses undamaged and connections tight; screen in jar cover hose not plugged; electrical connections tight; nozzle not plugged. If washer still inoperative, start wiper motor only, then push washer button and listen for click of washer relay.
  2. If relay click is heard, listen for soft clicking of pump ratchet wheel rotating. If soft click is not heard, pump is faulty. If soft click is heard and pump does not operate, check the following: Proper gear engagement. Check that cam gear teeth are not damaged. Valve assembly.
  3. If no relay click heard, check for voltage at washer No. 2 terminal. No voltage indicates faulty wiring. If voltage is correct, connect a jumper wire from washer No. 1 terminal to ground and turn on wiper. If washer relay clicks now and pump operates correctly, dash switch is faulty or there is an open circuit between pump and switch. If no click heard, relay coil is open.
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