TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
Page 249 of 870
TM 9-2350-247-20-1 BLACKOUT STOPLIGHT DOES NOT WORK—Continued 0039 00 8Y 1. Connect circuits 75 and 75A on stoplight switch. 2. Remove circuit 22 plug (1) from jack on left taillight, or circuit 23 plug (1) from jack on right taillight. 3. Turn main light selector switch lever on light switch to BO MARKER. 4. Measure voltage between circuit 22 (left) plug (1) or circuit 23 (right) plug (1) and ground with both steering levers locked in parking brake position. Reading should be less than 17 volts. 5. Is reading correct? YES NO 8YN 1. Install circuit plugs 22 (1) and 23 (1) on left and right taillights. 2. Replace service stop or BO stoplight bulb (WP 0278 00). 3. Verify no faults found. 9Y 1. Partially remove instrument panel (WP 0256 00). 2. Disconnect wiring harness connector from light select switch. 3. Place light panel switches in BO MARKER and PANEL BRT positions (see your -10). 4. Measure resistance between pins (1) (F, A),(F, B), and (F, E). Multimeter should show continuity. 5. Measure resistance between pins (1) (F, C),(F, D), (F, J),(F, H),(F, K), (F, L),(F, M), and (F, N). Multimeter should show infinity. 6. Move auxiliary switch to PARK (see your -10). Measure resistance between pins (1) F and L. Multimeter should show infinity. 7. Measure resistance between pins (1) K and N. Multimeter should show continuity. 8. Are readings correct? YES NO 9YN 1. Replace light switch (WP 0262 00). 2. Verify no faults found. 0039 00-5