TM 9-4910-663-34
Table 2-5. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BREAKERS CB5 RELAY CONTROL circuit breaker are all set to ON position. Set BATTERY
CIRCUIT SELECTOR switch S6 to 24V position, and check to make sure that 24 VOLT indicator
DS6 lights.
If 24 VOLT indicator DS6 fails to light, proceed to step 2; if indicator lights, proceed to step 4.
Step 2.
Remove lamp from 24 VOLT indicator DS6, and check lamp filament for continuity, using ohmmeter.
Replace lamp if filament is open.
Step 3.
With lamp removed from 24 VOLT indicator DS6, check for 39 ohm ±10% resistance indication
across resistor R4, using ohmmeter.
Replace resistor R4 if resistance is not as specified
Step 4.
Using ohmmeter, check for continuity between 24V battery terminal and STARTER + INPUT binding
post.
If open indication is obtained, proceed to step 5; if continuity indication is obtained, proceed to
step 8.
Step 5.
With circuit breaker switch CB1 set to ON position, check for 24 to 30 volt DC indication across coil
terminals of relay K3, using DC voltmeter.
If voltage is normal, replace relay K3; if no voltage is indicated, proceed to step 6.
Step 6.
Set circuit breaker switch CB1 to OFF position. Disconnect leads from one coil terminal of relay K3,
and check for coil resistance of 60.3 to 70.4 ohms, using ohmmeter. Then, reconnect leads.
Replace relay K3 if coil resistance is not as specified.
Step 7.
With circuit breaker switch CB1 set to OFF position, check for continuity between arm of BATTERY
CIRCUIT SELECTOR switch S6 and 24 volt position terminal of switch S6, using ohmmeter.
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