Undercharged Battery
- With ignition on, connect a voltmeter from alternator "BAT" terminal to ground, then from No. 1 terminal to ground, and last, No. 2 terminal to ground.
- A zero reading indicates an open between connection and battery. Opens in the No. 2 lead may be between terminals at the crimp between harness wire and terminal, or in wire. See Fig 1.NOTE: If preceding test is satisfactory, continue to next step.
- Disconnect battery ground cable. Connect an ammeter in circuit at "BAT" terminal of alternator. Reconnect battery ground cable. Turn on all available accessories.
- Connect a carbon pile across battery. Operate engine at 2000 RPM and adjust carbon pile as required to obtain maximum current output.
- Ampere output must be within 10 amps of rated output. If output is not within 10 amps of rated output, ground field winding by inserting a screwdriver into test hole. See Fig 1. Repeat step 4).
- If output is increases to within 10 amps of rated output with field grounded, regulator is defective. If output remains below 10 amps of rated output, check field winding, diode trio, rectifier bridge, and stator.
CAUTION:
Tab is within 3/4" of casting surface. DO NOT
force tool beyond 1" into end frame. If test hole is not accessible, proceed to TESTING (ON BENCH) as described under OVERHAUL.