TM 9-2320-302-20
0010 00-3
Table 1. Electrical System Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Headlight Circuits
1. Neither Headlight Operates When Switch Is
Turned On.
1. Check left and right headlight
15A fuses.
If defective, replace 15A fuses
(WP 0071 00).
2. Disconnect lead 420M from
vehicular light switch. Check
for +12 VDC at pin M.
If +12 VDC is present at vehicular
light switch, go to step 3. If voltage
is not present at vehicular light
switch, replace vehicular light
switch (WP 0063 00).
3. Disconnect
left
headlight
power relay from connector.
Check
for
+12
VDC
at
connector 85.
If +12 VDC is present, replace left
and right headlight power relay
(WP 0071 00). If voltage is not
present at connector 85, repair
lead 420M (WP 0119 00).
2. Left/Right Headlight Fails to Operate When
Switch Is Turned On.
1. Inspect headlight bulb.
Replace
bulb
if
broken
or
defective (WP 0083 00).
2. Check left headlight 15A fuse. If defective, replace 15A fuse (WP
0071 00).
3. Disconnect lead 14 from left
headlight 15A fuse. Check for
+12 VDC at lead 14.
If +12 VDC is present, go to step
4. If voltage is not present, repair
lead (WP 0119 00).
4. Disconnect ground lead from
left/right headlight. Check for
+12 VDC at ground lead to
left/right headlight.
If +12 VDC is present, repair
ground lead (WP 0119 00). If
voltage is not present, go to step 5.
5. Disconnect left/right headlight
power relay from connector.
Check for continuity between
connector 86 and ground.
If continuity is indicated, go to
step
6.
If
continuity
is
not
indicated, repair ground lead (WP
0119 00).
6. Disconnect left/right headlight
power relay from connector.
Check
for
+12
VDC
at
connector 30.
If +12 VDC is present, go to step
7. If voltage is not present, repair
lead 20 (WP 0119 00).
7. Disconnect left/right low/high
beam relay from connector.
Check
for
+12
VDC
at
connector 30.
If +12 VDC is present, replace left
low/high beam relay (WP
0071 00). If voltage is not present,
go to step 8.
8. Check for continuity between
connector
87
from
left
headlight power relay and
connector 30 from left low/
high beam relay. 0119 00).
If continuity is present, replace left
headlight power relay (WP
0071 00). If continuity is not
indicated, repair lead 20L (WP
3. Neither Headlight Low/High Beam Operates
When Turn Signal Switch Lever Is Set.
1. Disconnect ground lead from
dimmer switch lever. Check
for continuity between lead
and ground.
If continuity is present, go to step
2. If continuity is not indicated,
repair ground lead (WP 0119 00).
