TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download
Page 223 of 858
TM 9-2350-277-20-1 HORN DOES NOT WORK 0037 00 INITIAL SETUP: M a i n t e n a n c e L e v e l Unit T o o l s a n d S p e c i a l T o o l s General mechanic’s tool kit: automotive (WP 0926 00, Item 65) Multimeter (WP 0926 00, Item 30) Jumper wire P e r s o n n e l R e q u i r e d Unit Mech 63T10 Helper (H) R e f e r e n c e s See your -10 E q u i p m e n t C o n d i t i o n Engine stopped (see your -10) Vehicle blocked (see your -10) Trim vane removed (see your -10) Power plant access panels removed (see your -10) T 1. Remove lead 10863474 plug (1) from horn jack (2). 2. Measure resistance between lead 10863474 plug (1) and ground. 3. Does multimeter read 0 ohms? YES NO TN 1. Replace lead 10863474 and/or connector (WP 0382 00). 2. Verify no faults found. Y 1. Remove harness 8763491 circuit 25 plug (1) from horn jack (2). 2. Move MASTER POWER switch to ON. 3. Measure voltage between harness 8763491 circuit 25 plug (1) and ground with horn button depressed. 4. Does multimeter read less than 17 volts? YES NO YN 1. Replace horn (WP 0336 00). 2. Verify no faults found. 0037 00-1