ARMY TM 9-2815-259-24
AIR FORCE TO 38G1-125-2
MARINE CORPS 09249A/09246A-24
Section II. MAINTENANCE PROCEDURES
This section contains direct support maintenance procedures. Deficiencies noted during inspection which are
beyond the scope of direct support level maintenance shall be reported to the next higher level of maintenance.
ELECTRICAL SYSTEM MAINTENANCE.
BATTERY CHARGING ALTERNATOR.
(1) Remove battery charging alternator, refer to paragraph 3.9.1.
(2) Mount battery charging alternator on test fixture capable of providing 5000 alternator rpm.
Make sure connections are tight to avoid possible damage to instruments,
battery charging alternator, or wiring due to short circuits.
(3) Set up circuit as shown in Figure 4-1.
Carbon pile and ammeter must be capable of handling the alternator rated
(4) Starting with the carbon pile off, slowly increase load while observing ammeter and maintaining
5000 rpm. Increase load until an output voltage of 27.0 to 29.0 VDC is achieved. Record the
output current at this point. Acceptable current is 38 amperes at 70 to 80ºF (21.1 to 26.7ºC).
FIGURE 4-1. BATTERY CHARGING ALTERNATOR TEST CIRCUIT