TM 10-3930-669-20 2-14.  ELECTRICAL SYSTEM TROUBLESHOOTING (CONT). 10.  REAR WIPER DOES NOT OPERATE. INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Multimeter (Item 2, Appendix B) STE/ICE-R (Optional) (Item 14, Appendix B) References TM 10-3930-669-10 Equipment Condition Engine OFF (TM 10-3930-669-10) MAIN POWER switch OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) NOTE The following procedure covers the rear wiper, but the general steps can be used for the front or top wipers. KNOWN INFO TEST OPTIONS 24 vdc circuits operate. Top and front wiper operate. Voltage test. STE/ICE-R #89. POSSIBLE PROBLEMS REASON FOR QUESTION Lead wire 37 faulty. Rear wiper switch faulty. Rear wiper motor faulty. If    22    to    24    vdc    are    not present,     lead     wire     37     is faulty. 2-180