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TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download

Page 266 of 870

TM 9-2350-247-20-1 HORN DOES NOT OPERATE—Continued 0044 00 4Y 1. Remove circuit 25/25A plug (1) from horn switch jack (2). 2. (H) Measure resistance between horn switch jack (2) pins with horn switch depressed. 3. Does multimeter read 0 ohms? YES NO 4YN 1. Install horn ground lead plug to horn jack. 2. Install main wiring harness circuit 25 plug onto horn jack. 3. Replace horn switch (WP 0259 00). 4. Verify no faults found. 5Y 1. Remove jumper wire from main wiring harness circuit 25. 2. Install main wiring harness circuit 25 plug on horn jack. 3. Install a jumper wire between horn switch plug (1) circuit 25 pin (2) and ground. 4. Measure resistance between main wiring harness circuit 25 plug (2) and ground. 5. Does multimeter read 0 ohms? YES NO 5YN 1. Remove jumper wire from horn switch plug. 2. Repair main wiring harness circuit 25 (WP 0294 00). 3. Verify no faults found. 0044 00-4 6Y 1. Remove jumper wire from circuit 25A. 2. Repair main wiring harness circuit 25A (WP 0294 00). 3. Verify no faults found.