TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS TROUBLE SHOOTING (ELECTRIC) PROBLEM POSSIBLE CAUSE REMEDY Wiper will not operate. 1.  No voltage to wiper 1.  Check for open circuit or motor. blown fuse. 2.  Binds in wiper arm, 2.  Eliminate binds. shafts or linkage. 3.  Link rod loose from 3.  Secure rod end clip. drive lever. 4.  Faulty switch. 4.  Replace switch. 5.  Faulty motor assembly. 5.  Replace motor. Damaged gear teeth. 1.  Wiper blades striking 1.  Adjust wiper arm park windshield molding position. during operation. 2.  Binding in connecting 2.  Correct linkage. links. 3.  Operator stopping blades 3.  Caution operator. manually when wiper is operating. 4.  Drive arm not held when 4.  Hold drive arm in vise or drive arm nut is tight- by hand when tightening ened. nut. Wiper will not shut off. Faulty switch. Replace switch. Wiper continually shutting off. 1.  Binding condition in wiper 1.  Eliminate binds. arm shafts, connecting links or drive gear and shaft. 2.  Faulty harness connections. 2.  Correct wiring harness connectors and terminals. 3.  Faulty motor assembly. 3.  Replace motor. Wiper operates at one 1.  Faulty switch. 1.  Replace switch. speed only. 2.  Faulty connection. 2.  Correct wiring. Wiper motor speed excessive Faulty motor assembly. Replace motor. under light load but stalls under heavy load. Wiper motor noisy. Faulty motor assembly. Replace motor. CTS-2732  Page 5 PRINTED IN UNITED STATES OF AMERICA