ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
1. BATTERIES WILL NOT HOLD A CHARGE - CONTINUED
Although ignition lock switch must be on and battery ground cable connected to test electrical circuit
voltage, turn off ignition lock switch and disconnect battery ground cable before doing resistance tests or
replacing parts. This will keep you from getting shocked and prevent damage to parts and equipment.
Turn ignition lock switch (1) clockwise to ignition. Using multimeter set to 30 vdc scale, place red
probe on ac generator terminal (2) and black probe on ac generator terminal (3). Check for reading of
1.5 to 2.0 vdc with 55 amp ac generator or 2.0 to 3.0 with 35 amp ac generator on multimeter.
If multimeter reads as specified, go to step 6.
If multimeter does not read as specified, go to step 7.
Start and run engine at 1400 rpm for 15 minutes (TM 5-2420-222-10). Using thermometer and 6-inch
machinist's steel rule, measure temperature 1-inch (25.4mm) from voltage regulator (4). Using
generator terminal (3). Check for reading of 0.8 to 1.2 vdc plus temperature voltage correction from
chart below. Move red probe to ac generator terminal (5) and check multimeter reading. Multimeter
reading should be approximately 1 vdc less than reading obtained at ac generator terminal (2). Shut
down engine (TM 5-2420-222-10).
14.4 - 14.9 volts
14.3 - 14.7 volts
14.2 - 14.6 volts
14.0 - 14.4 volts
13.8 - 14.3 volts
13.6 - 14.1 volts