TM 9-6115-730-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
CORRECTIVE ACTION - Continued
STEP 5.
If 24 Vdc battery voltage is not indicated on voltmeter, check DC voltage between
relay KFF-14 (+) and 13 (-).
a.
If 24 Vdc is present, replace relay KFF (WP 0042).
b.
If 24 Vdc is not present, check for 24 Vdc at GSC RM-18 (+) and ground
with ENGINE CONTROL switch set to MANUAL START.
(1) If 24 Vdc is present, repair wiring between RM-18 and relay KFF-14.
(2) If 24 Vdc is not present, replace GSC (WP 0041).
STEP 6.
Set ENGINE CONTROL switch to OFF/RESET.
STEP 7.
Connect DC voltmeter to digital voltage regulator (DVR) pins A3-F1 (+) and A3-
F2 (-) (FO-4, sheet 3).
STEP 8.
Set ENGINE CONTROL switch to MANUAL START. Engine should crank.
a.
If 9 to 16 Vdc is not indicated on voltmeter, replace diode CRFF
b.
If diode is good, replace 15 ohm 25W resistor on resistor assembly A7
STEP 9.
Allow engine to start and verify generator is rotating at or near proper speed.
STEP 10.
Measure DC generator excitation voltage at DVR pins A3-F1 (+) and A3-F2 (-).
a.
If voltage is less than 9 Vdc, replace DVR (WP 0042).
b.
If voltage is greater than 15 Vdc, replace generator (WP 0083).
STEP 11.
Verify the problem has been resolved.
SYMPTOM
10.
Generator Produces Low Voltage Under No Load Condition.
MALFUNCTION
DVR Malfunction.
CORRECTIVE ACTION
STEP 1.
Check for DVR fault codes.
a.
If DVR fault codes are present, troubleshoot DVR (WP 0010).
b.
If DVR fault codes are not present, proceed to STEP 2.
STEP 2.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL Switch to MANUAL START.
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