TM 9-4910-663-34
Table 2-5. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Replace switch S6 if continuity indication is not obtained.
Step 8.
Connect ohmmeter between 12V battery terminal and STARTER + INPUT binding post. Set
BATTERY CIRCUIT SELECTOR switch S6 to 12V position. Check to see that 12 VOLT indicator
DS5 lights, and ohmmeter indicates continuity.
If 12 VOLT indicator fails to light, proceed to step 9; if ohmmeter indicates open circuit, proceed
to step 11; if indications are normal, proceed to step 14.
Step 9
With circuit breaker switch CB1 set to OFF position, remove lamp from 12 VOLT indicator, and
check lamp filament for continuity, using ohmmeter.
Replace lamp if filament is open.
Step 10. With lamp removed from 12 VOLT indicator, check for 39 ohm ±10% resistance indication across
resistor R3, using ohmmeter.
Replace resistor R3 if resistance indication is not as specified.
Step 11. With circuit breaker switch CB1 set to ON position, check for 24 to 30 volt DC indication across coil
terminals of relay K2, using DC voltmeter.
If voltage is normal, replace relay K2; if no voltage is indicated, proceed to step 12.
Step 12. Set circuit breaker switch CB1 to OFF position. Disconnect leads from one coil terminal of relay K2.
Using ohmmeter, check for relay K2 coil resistance between 60.3 and 70.4 ohms. Then reconnect
leads.
Replace relay K2 if resistance is not as specified.
Step 13. With circuit breaker switch CB1 set to OFF position, check for continuity between arm of BATTERY
CIRCUIT SELECTOR switch S6 and 12 volt position terminal of switch S6, using ohmmeter.
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