TM 9-2320-289-34
Table 2-2. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 13. Check voltage between rear battery positive (+) and negative (-) terminals.
If voltage is above 14,2, and voltage in step 12 does not drop, replace
current/voltage regulator, (See paragraph 4-4) Perform step 11,
If voltage is above 14,2, and voltage in step 12 drops to 16.5-26.5 or below
15.5, replace current/voltage regulator relay. (See paragraph 4-4) Perform
step 12.
If voltage is not above 14.2, perform step 14.
Step 14. Check rear battery for proper charge and electrolyte level. (See
TM 9-2320-289-20) Remove and clean rear battery cable and clamp connections.
Service or replace rear battery. Replace worn or damaged battery cables and
clamps. (See TM 9-2320-289-20) Perform step 12.
Step 15. Check voltage at current/voltage regulator relay “FLD” terminal for several
minutes, Voltage should be 6,0-11.0, drop to 0.0 for about 2 seconds each
minute, and return to 6.0-11.0.
If current/voltage regulator relay does not operate properly, replace. (See
paragraph 4-4) Repeat this step.
If current/voltage regulator relay operates properly, perform step 190
Step 16. Shut off engine. Remove upper alternator voltage regulator (see
TM 9-2320-289-20) and ensure that adjustment screw is in “HI” position.
If adjustment screw is in “HI” position, perform step 18.
If adjustment screw is not in “HI” position, perform step 17.
Step 17. Install adjustment screw in
“HI” position and install voltage regulator. (See
TM 9-2320-289-20) Start engine and operate at 1200-1500 rpm. Check voltage at
upper alternator positive (+) terminal.
If voltage is 28,5-29,1, perform step 12.
If voltage is not 28.5-29.1, perform step 18.
Step 18. Replace upper alternator voltage regulator. (See TM 9-2320-289-20) Start engine
and operate at 1200-1500 rpm. Check voltage at upper alternator positive (+)
terminal.
If voltage is 28.5-29.1, perform step 12.
If voltage is not 28.5-29.1,
remove and test upper alternator. (See
paragraph 4-3) Perform step 11,
Step 19. Shut off engine and install 10 amp/28 v (voltmeter) fuse. (See TM 9-2320-289-20)
Start engine and check voltmeter.
If voltmeter is not in green zone, replace voltmeter. (See TM 9-2320-289-20)
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