TM 9-2330-356-14
Table 5-4. Troubleshooting - Direct Support (Con`t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ALTERNATOR AND CHARGING CIRCUIT (Con't)
16. UNDERCHARGED BATTERIES (Con't).
Step 2.
Check for loose or corroded battery terminals and connections, or bad battery.
Clean and tighten battery connections. Test battery (para 4-23).
Look for worn or glazed pulley or loose belts on alternator drive.
Step 3.
Adjust tension on alternator drive belt (para 4-78). Replace pulley if worn or glazed.
Step 4.
Check for excessive voltage drop between alternator and batteries (para 7-91).
Clean and tighten connections at positive and negative output terminals on alternator
(para 7-91). Also check connections at
buss bar
assembly and
ground (wire No. 3) on
Step 5.
Check engine wiring, especially wire No. 6 (from buss bar to starter solenoid and from buss bar to
engine junction box), for damage (fig. 4-28 or 4-29).
Replace damaged wire.
Step 6.
Adjust voltage regulator.
Step 7.
Repair or replace alternator.
NOTE
Small current draw (90 milliamps) through field circuit when engine Is not running Is normal.
This is the bleed circuit built Into the voltage regulator.
Step 8.
Test for leaking positive rectifier causing field current draw (2-4 amps) when engine is not running.
Step 9.
Replace voltage regulator.
17. OVERCHARGED BATTERIES (Indicated by high water usage).
Step 1.
Replace damaged battery.
Check specific gravity or voltage of individual cells (para 4-23).
Step 2.
Replace defective battery.
5-8