TM 9-2320-302-20
0010 00-9
Table 1. Electrical System Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Dome Light Circuits - Continued
1. Dome Lights Do Not Operate - Continued.
3. Disconnect
connector
from
vehicular light switch. Check
for +12 VDC at pin J.
If +12 VDC is present, repair lead
420J (WP 0119 00). If voltage is
not present, replace vehicular light
switch (WP 0063 00).
2. One Dome Light Operates, But Other Dome
Light Does Not Operate in Either Mode.
1. Inspect light bulb.
Replace
bulb
if
broken
or
defective (WP 0091 00).
2. Disconnect
lead
41
from
defective dome light. Check
for continuity from dome light
ground lead to ground.
If continuity is indicated, go to
step
3.
If
continuity
is
not
indicated, repair ground lead (WP
0119 00).
3. Disconnect
lead
41
from
defective dome light. Check
for +12 VDC at lead 41.
If +12 VDC is present, replace
dome light assembly (WP
0091 00). If voltage is not present,
repair lead 41 (WP 0119 00).
3. Dome Light Operates in On/Off Switch Mode
Only.
1. Inspect dome light lamp.
Replace lamp if defective (WP
0091 00).
2. Check for continuity between
socket and ground.
If continuity is indicated, replace
dome light assembly (WP
0091 00).
Auxiliary Light Circuits
1. Auxiliary Lights or Accessory Circuits Do Not
Operate.
1. Check
for
+12
VDC
at
auxiliary light power bus.
If +12 VDC is present, repair
auxiliary light power bus. If
voltage is not present, go to step 2.
2. Disconnect
auxiliary
lights
power relay. Check for +12
VDC at connector 30.
If +12 VDC is present, go to step
3. If voltage is not present, repair
lead 420JC (WP 0119 00).
3. Check
for
+12
VDC
at
auxiliary lights power relay
connector 85.
If +12 VDC is present, go to step
4. If voltage is not present, check
dome/auxiliary/flasher 15A fuse.
If defective, replace 15A fuse (WP
0071 00). Check for continuity in
lead 420JA and lead 420J. If
continuity is not indicated, repair
lead 420JA or 420J (WP 0119 00).
If +12 VDC is still not present at
connector 85, replace vehicular
light switch (WP 0063 00).
4. Disconnect
auxiliary
lights
accessory
lockout
relay.
Check
for
+12
VDC
at
connector 87.
If +12 VDC is present, go to step
5. If voltage is not present, check
lead 420JB for continuity. If
continuity is not indicated, repair
lead 420JB (WP 0119 00). If
voltage is still not present at
connector 87, replace auxiliary
lights power relay (WP 0071 00).
