TM 5-3805-262-205-8. SENDING UNITS AND WARNING SWITCHES MAINTENANCE (CONT) g. Air Pressure Sender (cont).INSPECTION, TESTING, AND REPAIR(1)(2)(3)( 4)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.Inspect air pressure sender (5) for cracks, breaks, damaged threads, dis-t o r t i o n , broken or missing terminal, or other damage. Replace if any ofthese conditions are seen.Inspect remaining parts for cracks, breaks, distortion, or damagedthreads;replace as necessary.Test air pressure sender (5) as follows:( a)Connect air pressure sender to a source of compressed air and pressurer e g u l a t o r.(b)Connect multimeter between air pressure sender body and terminal asshown below.( c)Slowly increase air pressureapplied to air pressure senderwhile watching pressure regulatorgage and multimeter. With zero psiapplied, multimeter shouldindicate zero to 6 ohms; at 30 psipressure multimeter shouldindicate 17 to 27 ohms; at 65 psi,40 to 50 ohms; at 90 psi, 60 to 70ohms; and at 120 psi, 80 to 96ohms.(d)Disconnect multimeter, reduce airpressure to zero, and remove airpressure sender from compresseda i r s o u r c e.( e)Replace air pressure sender if multimeter indications in step (c)above are not obtained.5-138
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