Wagoneer L6-258 4.2L VIN C 2-bbl (1982)
Generator: Testing and Inspection
Delco-Remy Alternators
UNDERCHARGED BATTERY
Preliminary Checks
1.
Ensure accessories have not been left on for extended periods, causing undercharged condition.
2.
Check alternator drive belt for proper tension.
3.
Check battery for internal defects.
4.
Check all wiring connections for corrosion or looseness. Repair or replace as necessary.
5.
With ignition switch On and alternator leads connected, connect voltmeter from:
a. Alternator "BAT" terminal and ground.
b. Alternator No. 1 terminal and ground.
c. Alternator No. 2 terminal and ground.
6.
If reading in step 5 is zero volts, check for open between voltmeter connection and battery.
Fig. 7 Grounding field windings
Troubleshooting Procedure
1.
Disconnect battery ground cable.
2.
Disconnect wire at "BAT" terminal of alternator, connect ammeter, positive lead to "BAT" terminal and negative lead to wire.
3.
Connect battery ground cable.
4.
Turn on all accessories, then connect a carbon pile regulator across battery.
5.
Operate engine at moderate speed, adjust carbon pile regulator to obtain maximum current output.
6.
If ammeter reading is within 10 amps of rated output, alternator is not at fault. Alternator rated output is stamped on alternator frame.
7.
If ammeter reading is not within 10 amps of rated output, ground field winding by inserting screwdriver in end frame hole, contacting tab. Do not
insert screwdriver deeper than one inch, as tab is usually located within 3/4 inch of casing surface.
8.
If reading is within 10 amps of rated output, check field winding, diode trio, rectifier bridge and voltage regulator. If reading is not within limits,
check field winding, diode trio, rectifier bridge and stator.
9.
Turn off all accessories and disconnect ammeter and carbon pile regulator.
