TM 5-3805-262-205-8. SENDING UNITS AND WARNING SWITCHES MAINTENANCE (CONT)c. Water Temperature Sending U n i t ( c o n t ).INSPECTION, TESTING, AND REPAIR(1) Inspect wiring harness terminal (4) wire for cracked or broken insulationor broken wire strands at connection to terminal. Repair cracked or bro-ken insulation by applying insulation tape to area. If broken wirestrands are seen, cut wire as close to terminal as possible. Strip 1/4inch insulation from end of wire taking care not to cut through wire thencrimp new terminal securely onto wire.(2)Inspect water temperature sending unit (5) for cracks, breaks, damagedthreads, distortion, broken or missing terminal, or other damage. Replaceif any of these conditions are seen.( 3 ) I n s p e c t r e m a i n i n g p a r t s f o r c r a c k s , b r e a k s , d i s t o r t i o n , o r d a m a g edthreads;replace as necessary.(4) Test water temperature sending unit (5) as follows:( a)(b)(c)(d)( e)Connect multimeter between water temperature sending unit body andterminal as shown below.Lower a thermometer and threaded end of water temperature sending unitinto a pan of water.Slowly heat and stir water while watching thermometer and multimeter.At 100 degrees F, multimeter should indicate 3000 to 3600 ohms. At 200degrees F, multimeter should indicate 640 to 780 ohms.Remove water temperature sending unit and thermometer from water anddisconnect multimeter.Replace water temperature sending unit if multimeter indications instep (c) above are not obtained.5-122
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