Delco Alternator; Delco Charging System Diagnosis; Voltage Regulator; Servicing Precautions - Jeep 1987 Wrangler Workshop Manual

ELECTRICAL
CHARGING SYSTEM - DELCO
DELCO ALTERNATOR
Other than a regularly scheduled drive belt
tension adjustment, the alternator assembly
requires no periodic adjustment or main-
tenance. The bearings have sufficient lubricant
for the life of the alternator and do not require
periodic lubrication.
NOTE: All bolt and screw threads are in metric
dimensions.
Voltage Regulator
The voltage regulator unit is attached inside the
rear housing of the alternator. The voltage
regulator is not adjustable or repairable.
DELCO CHARGING SYSTEM DIAGNOSIS
Servicing Precautions
To avoid damage to the charging system,
always observe the following precautions:
• do not attempt to polarize the regulator
• do not short across or ground any of the
terminals in the charging system except as
specifically instructed
• when the output terminal circuit is open and
the No. 1 and No. 2 wire terminals are
connected to the alternator never drive the
alternator
• ensure that the alternator and battery have the
same ground polarity
• when connecting a charger or a booster
battery to the battery, connect the positive
clamp to the positive battery terminal and the
negative clamp to the engine block
• never drive the alternator with the engine
when the output terminal circuit is open (i.e.,
not connected).
Charging System Malfunction Symptoms
Malfunction of the charging system is usually
indicated by one or more of the following
symptoms:
• faulty voltmeter operation
• an undercharged battery, indicated by slow
engine cranking and battery electrolyte
having low specific gravity
• an overcharged battery, indicated by exces-
sive water usage
Electrical Test Inspection
Prior to performing any electrical tests, visually
inspect all charging system components and
wiring for obvious discrepancies.
Visual
Inspection
Battery Posts, Engine Block, Starter Motor Solenoid
• inspect for clean and tight cable terminal
connections at the battery posts, engine
block, and starter motor solenoid
Alternator, Starter Motor Solenoid, Alternator
Voltmeter Wiring
• inspect for corrosion and loose wire terminal
connections at the alternator, starter motor
solenoid, dash panel connector and the
charging system indicator
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