TM-9-2320-365-20-1 LMTV Unit Maintenance Manual M1078 Series - Volume 1 Download
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e62. TRAILER MARKER/TAILLIGHTS DO NOT ILLUMINATE (CONT) TM 9-2320-365-20-1 2-752 Change 1 CAUTION Read CAUTION on following page. 2. Is continuity present from connector J130 socket E to relay K28 terminal 87? TEST OPTIONS Continuity Test or STE/ICE-R Test #91 REASON FOR QUESTION This question eliminates possible problems and determines where troubleshooting continues. KNOWN INFO Towing vehicle marker/taillights OK. Circuit breaker CB41 OK. Trailer electrical system OK. POSSIBLE PROBLEMS Faulty dashboard cable assembly. Faulty relay K28. Faulty rear lights cable assembly. Faulty rear intervehicular 24 VDC (12 pin) cable. NO Go to step 6 of this fault. YES WARNING Read WARNING on following page. 3. Is 24 VDC present at relay K28 terminal 30 on PDP? TEST OPTIONS Voltage Test or STE/ICE-R Test #89 REASON FOR QUESTION If 24 VDC is not present, wire 1957 is faulty. KNOWN INFO Towing vehicle marker/taillights OK. Circuit breaker CB41 OK. Trailer electrical system OK. Rear lights cable assembly OK. Rear intervehicular 24 VDC (12 pin) cable OK. POSSIBLE PROBLEMS Faulty dashboard cable assembly. Faulty relay K28. NO Repair wire 1957 from K28 terminal 30 on PDP to circuit breaker CB41 terminal 2 (para 2-40) or replace WTEC II dashboard cable assembly (para 7-10) or WTEC III dashboard cable assembly (para 7-11). YES