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CHARGING SYSTEM
1E-3
Capacitor CI provides voltage continuity across R3,
R4 prevents excessive current through TR1 at high tem-
peratures, and D3 prevents high induced voltages in the
field windings when TR1 turns Off. Resistor R2 is a
thermistor which causes the regulated voltage to vary
with temperature, providing the optimum voltage for
charging the battery.
TROUBLESHOOTING
Close adherence to the following procedures in the
order presented will lead to the location and correction
of charging system defects in the shortest possible time.
Figure 1E-3 is a basic wiring diagram showing lead
connections.
7 0 1 3 6
Fig. 1E-3
Basic Lead Connections
To avoid damage to the electrical equipment, always
observe the following precautions:
• Do not polarize the alternator.
• Do not short across or ground any of the terminals
in the charging circuit except as
specifically
instructed.
• NEVER operate the alternator with the output ter-
minal circuit open and No. 1 and No. 2 terminals
connected to the alternator.
• Make sure the alternator and battery have the same
ground polarity.
• When connecting a charger or a booster battery to
the vehicle, connect negative to negative and positive
to positive.
N O T E : An ammeter is used on Cherokee,
Wagoneer
and Truck to indicate charging rate. CJ models are
equipped with a voltmeter.
Trouble in the charging system will show up as one of
more of the following conditions:
• Faulty voltmeter or ammeter operation.
• An undercharged battery, evidenced by slow crank-
ing and low specific gravity readings.
• A n overcharged battery, evidenced by excessive
water usage.
Before making any electrical checks, perform a visual
inspection of all charging system components and
wiring.
Visual Inspection
Check for clean and tight cable connections at the
battery posts, engine block, and starter solenoid. Check
for corrosion and loose wire connections at the alterna-
tor, starter motor solenoid, and the charging system
indicator. Inspect all wiring for cracked or broken in-
sulation. Be sure alternator mounting screws are tight
and unit is properly grounded. Inspect the fluid level in
the battery and add water if necessary. Check for loose
alternator drive belt.
Alternator
Noise
Alternator noise may be caused by one of the follow-
ing conditions:
• Loose mounting screws.
• Loose or misaligned pulley.
• Worn or dirty bearings.
• Out-of-round or rough slip rings.
• Defective brushes.
• Shorted rectifier diode (indicated by high-pitched
whine).
Noise from the cooling system can also sound like
alternator noise. Disconnect and plug the heater hoses to
eliminate the possibility of the alternator bracket acting
as a sounding board for heater core noises.
Faulty Voltmeter or Ammeter Operation
Diagnosis of instrumentation is covered fully in Chap-
ter 1L—Power Plant Instrumentation.
Overcharged/Undercharged
Battery
For battery overcharged-undercharged diagnosis, re-
fer to DARS Charts 1 and 2.
Alternator Leakage
If the alternator is suspected of discharging the bat-
tery because of excessive leakage, perform the following
procedure, using a bulb socket with jumper wires at-
tached and a No. 158 bulb.
(1) Disconnect battery lead to alternator.
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Table of Contents
Troubleshooting
