TM 1-1520-238-T-5 Change 8 8–149 8–77. PILOT AND CPG ENG–RTR RPM% INDICATORS – DO NOT INDICATE 8–77 ENGINE 2 N_P Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer References: TM 1-1520-238-23 TM 55-2840-248-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions– RN1 door opened WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. 1. Check for 490 to 510 ohms resistance between P24–12 and P24–13. Is resistance present? YES Go to step 2. NO Go to step 3. 2. Detach wire ends at (A326): TB1–9–N and TB1–9–T. Check for short between: J24–12 and J24–13, J24–14 and J24–12, J24–14 and J24–13. Does short exist? YES Repair shorted wire between: J24–13 and P470–B1. (A326): J19–B1 and TB1–9–T, J19–B2 and TB1–9–N. Go to paragraph 8–10. NO Repair open wire between: J24–13 and (A326)TB1–9–T, J24–12 and (A326)TB1–9–N. Go to paragraph 8–10. 3. Check for open between: P24–12 and P42–9, P24–13 and P42–8. Does open exist? YES (ABY) Repair open wire. Go to paragraph 8–10. (ABZ) Replace wire harness (TM 1-1520-238-23). NO Go to step 4. 4. Detach P42. Check for short between: P24–14 and P24–12, P24–14 and P24–13, P24–12 and P24–13. Does short exist? YES (ABY) Repair shorted wire. Go to paragraph 8–10. (ABZ) Replace wire harness (TM 1-1520-238-23). NO Refer to TM 55-2840-248-23 to troubleshoot engine 2. END OF TASK