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Page Title:
Table 1. Blackout Light Circuits Troubleshooting Procedures. |
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 TM 9-2320-303-24-1
Table 1. Blackout Light Circuits Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
None Of The Blackout (B/o) Stoplights 3. Check for +24
VDC
at If +24 VDC is present, go to step
Operate - Continued.
connector 85.
4. If no voltage is present, repair
lead 420N.
4. Check for continuity between If continuity is indicated, go to
connector 86 and ground.
step 5. If no continuity is
indicated, repair ground lead.
5. Install jumper wires between If +24 VDC is present, repair lead
connector 30 and stoplights 421F. If no voltage is present,
relay, connector 85 and replace B/O stoplights relay.
stoplights relay, and connector
86 and stoplights relay. Check
for +24 VDC at stoplights relay
contact 87.
3.
One Or More Blackout (B/O) Stoplights Not 1. Inspect light bulb(s).
Operating.
2. Remove
lamp(s)
from
If continuity is indicated, go to
defective circuit(s) (WP 0082
step 3. If no continuity is
indicated, replace lamp(s) (WP
between socket and ground.
3. Disconnect ground (B/O) If continuity is indicated, repair
stoplight(s).
Check
for lead(s) 421F. If no continuity is
continuity between ground indicated, repair ground lead(s).
lead(s) and ground.
4.
None Of The Blackout (B/O) Marker Lights 1. Inspect light bulbs.
Operate.
2. Disconnect B/O marker lights If +24 VDC is present, go to step
relay from connector. Check 3. If no voltage is present, repair
for +24 VDC at connector 30. lead 421V.
3. Check for +24
VDC
at If +24 VDC is present, go to step
connector 85.
4. If no voltage is present, repair
lead 420E.
4. Check for continuity between If continuity is indicated, go to
connector 86 and ground.
step 5. If no continuity is
indicated, repair ground lead.
5. Install jumper wires between
If +24 VDC is present, repair lead
connector 30 and stoplights
421A. If no voltage is present,
relay, connector 85 and
replace B/O marker lights relay
stoplights relay, and connector
86 and stoplights relay. Check
for +24 VDC at stoplights relay
contact 87.
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