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TM-9-2320-365-20-1 LMTV Unit Maintenance Manual M1078 Series - Volume 1 Download

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e66. TRAILER BLACKOUT STOPLIGHTS DO NOT ILLUMINATE (CONT) TM 9-2320-365-20-1 2-798 Change 1 CAUTION Read CAUTION on following page. 7. Is continuity present from connector P51 socket 8 to connector P53R socket 6? TEST OPTIONS Continuity Test or STE/ICE-R Test #91 REASON FOR QUESTION KNOWN INFO Towing vehicle blackout stoplights OK. Circuit breaker CB39 OK. Trailer electrical system OK. Dashboard cable assembly OK. Relay K27 OK. POSSIBLE PROBLEMS Faulty rear lights cable assembly. Faulty rear intervehicular 24 VDC (12 pin) cable. NO YES Replace intervehicular 24 VDC cable (para 7-79). Repair wire 23T from connector P51 socket 8 to connector P53R socket 6 (para 2-40) or replace rear lights cable assembly (para 7-75). If continuity is not present, wire 23T is faulty. If continuity is present, intervehicular 24 VDC (12 pin) cable is faulty.