TM-9-2320-361-20

2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)

TECHNICAL MANUAL; UNIT MAINTENANCE

OCTOBER 1991
TM-9-2320-361-20

  TM-9-2320-361-20 - Page 189 of 1207

TM 9-2320-361-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR lNSPECTlON
CORRECTIVE ACTION
18. FRONT MARKER LAMP DOES NOT LIGHT
Test 1. Test battery voltage at front composite light.
Step 1. Turn auxiliary light switch lever to OFF position.
Step 2. Disconnect lead 491 at rear of front composite light with lamp failure.
Step 3. Turn auxiliary light switch to PARK position.
Step 4. Check for battery voltage on contact end of lead 491.
a. If battery voltage is present, go to test 2.
b. If battery voltage is not present, go to malfunction 17, test 3, and test lighting system
harness connector pin L.
Test 2. Test continuity of filament in front marker lamp.
Set multimeter to RX1 scale. Check continuity between frame ground and lead 491 connected to
front composite light.
a. If continuity is not present, replace marker lamp (para. 4-45).
b. If continuity is present, check for corroded contacts at lamp and lead 491 connection to
front wiring harness. Reconnect lead 491.
END OT TESTING!
19. TAILLIGHT OR CLEARANCE LAMP DOES NOT LIGHT
Test 1. Test battery voltage at rear composite light.
Step 1.
Step 2.
Step 3.
Step 4.
Turn main light switch lever to OFF position.
Disconnect lead 21 from rear composite light with light failure.
Turn main light switch lever to SERVICE DRIVE position.
Check for battery voltage on contact end of lead 21.
a. If battery voltage is present, go to test 2 and check lamp filaments (para. 4-46).
b. If voltage is not present, go to malfunction 17, test 3, and check front wiring harness
pin H.
Test 2. Test continuity of filament in taillight lamp.
Set multimeter to RX1 scale. Check continuity between lead 21 connected to rear composite light
and frame ground.
a. If continuity is not present, replace taillight lamp (para. 4-46).
b. If continuity is present, check for corroded contacts at lamp and lead 21 connection to
rear wiring harness. Reconnect lead 21.
END OF TESTING!
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