Generator Symptom Diagnosis

A charging circuit wiring diagram for generator connection is shown in Generator Description . To avoid damage, always follow these precautions:

CAUTION:

Do not mistake polarities of "IG" terminal and "L" terminal.
Do not create a short circuit between "IG" and "L" terminals. Always connect these terminals through a lamp.
Do not connect any load between "L" and "E".
When connecting charger or booster battery to vehicle battery, see JUMP STARTING IN CASE OF EMERGENCY .

Trouble in charging system will show up as one or more of the following conditions:

Faulty charge indicator light operation.
Undercharged battery as evidenced by slow cranking or indicator clear with red dot.

Overcharged battery as evidenced by excessive spewing of electrolyte from vents.

CHARGING SYSTEM DIAGNOSIS CHART

Condition	Possible Cause	Action
Noisy generator	Loose drive belt	Adjust or replace drive belt .
	Loose drive belt pulley	Check generator .
	Loose mounting bolts	Check mounting condition .
	Worn or dirty bearings	Check generator .
	Defective diode or stator	Check generator .
Charge indicator light does not light with ignition ON and engine OFF	Fuse blown	Check fuse .
	Light burned out	Replace light .
	indicator lamp (LED) faulty	Check BCM, combination meter and/or CAN communication line .
	Wiring connection loose	Tighten loose connection .
	IC regulator or field coil faulty	Check generator .
	Poor contact between brush and slip ring	Repair or replace .
Charge indicator light does not go out with engine running Battery requires frequent recharging	Drive belt loose or worn	Adjust or replace drive belt .
	IC regulator or generator faulty	Check charging system .
	Wiring faulty	Repair wiring .