FULLY CHARGED BATTERIES AND HIGH CHARGING RATE (BATTERIES OVERCHARGING)

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. BATTERIES WILL NOT HOLD A CHARGE - CONTINUED

WARNING

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.

NOTE

If batteries are not fully charged, it may be necessary to increase engine rpm slightly higher than specified

to obtain desired reading on multimeter.

Step 8.

Connect jumper wire between ac generator terminals (1 and 2) start engine and run at 800 rpm (TM

5242022210). Using multimeter set to 30 vdc scale, place red probe on ac generator terminal (1) and

black probe on ac generator terminal (3). Check for reading of 15 to 16 vdc. Shut down engine (TM

5-2420-222-10) and disconnect jumper wire.

If multimeter reads 15 to 16 vdc, replace voltage regulator (page 2-452).

If multimeter does not read 15 to 16 vdc, replace ac generator (alternator) (page 2-436).

2. FULLY CHARGED BATTERIES AND HIGH CHARGING RATE (BATTERIES OVERCHARGING)

WARNING

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.

NOTE

Voltage regulator must be checked with an ac generator that is serviceable. If ac generator condition is

questionable, go to Electrical System Malfunction1: Batteries Will Not Hold A Charge, steps 3 thru 8

2-4