TEST OPTIONS                        KNOWN INFO              NO YES WARNING Read WARNING on following page. Voltage Test or STE/ICE-R Test #89     REASON FOR QUESTION     3.        POSSIBLE PROBLEMS        Is 24 VDC present at relay K29 terminal 30 on PDP? Faulty dashboard cable assembly. Faulty relay K29. Towing vehicle blackout marker lights OK. Circuit breaker CB42 OK. Trailer electrical system OK. Rear lights cable assembly OK. Rear intervehicular 24 VDC (12 pin) cable OK. e65. TRAILER BLACKOUT MARKER LIGHTS DO NOT ILLUMINATE (CONT) TM 9-2320-365-20-1 2-782          Change 1 If 24 VDC is not present, wire 1958 is faulty. Repair wire 1958 from K29 terminal 30 on PDP to circuit breaker CB42 terminal 4 (para 2-40) or replace WTEC II dashboard cable assembly (para 7-10) or WTEC III dashboard cable assembly (para 7-11).             KNOWN INFO                         TEST OPTIONS            Continuity Test or STE/ICE-R Test #91     REASON FOR QUESTION            POSSIBLE PROBLEMS        2. CAUTION Read CAUTION on following page. Faulty dashboard cable assembly. Faulty relay K29. Faulty rear lights cable assembly. Faulty rear intervehicular 24 VDC (12 pin) cable. Towing vehicle blackout marker lights OK. Circuit breaker CB42 OK. Trailer electrical system OK. This question eliminates possible problems and determines where troubleshooting continues. Is continuity present from connector J130 sockets A, C, and H to relay K29 terminal 87? YES Go to step 6 of this fault. NO