TM-9-2320-365-20-1 LMTV Unit Maintenance Manual M1078 Series - Volume 1 Download
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TEST OPTIONS REASON FOR QUESTION KNOWN INFO Voltage Test or STE/ICE-R Test #89 POSSIBLE PROBLEMS WARNING Read WARNING on following page. 4. Faulty dashboard cable assembly. Faulty relay K27. Towing vehicle blackout stoplights OK. Circuit breaker CB39 OK. Trailer electrical system OK. Rear lights cable assembly OK. Rear intervehicular 24 VDC (12 pin) cable OK. e66. TRAILER BLACKOUT STOPLIGHTS DO NOT ILLUMINATE (CONT) TM 9-2320-365-20-1 2-794 Change 1 Is 12 VDC present at relay K27 terminal 86 on PDP? If 12 VDC is not present, wire 23 is faulty. NO Repair wire 23 from relay K27 terminal 86 on PDP to connector PX15 socket N (para 2-40) or replace WTEC II dashboard cable assembly (para 7-10) or WTEC III dashboard cable assembly (para 7-11). YES Replace relay K27 (para 7-9). YES If continuity is not present, wire 3044 is faulty. REASON FOR QUESTION Continuity Test or STE/ICE-R Test #91 TEST OPTIONS Repair wire 3044 from K27 terminal 85 on PDP to terminal board TB2 position 34 (para 2-40) or replace WTEC II dashboard cable assembly (para 7-10) or WTEC III dashboard cable assembly ( para 7-11). NO Is continuity present from relay K27 terminal 85 on PDP to ground? 5. KNOWN INFO Towing vehicle blackout stoplights OK. Circuit breaker CB39 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 K27.