Diagnostic Information And Procedures; Battery Inspection - Suzuki Grand Vitara Service Manual

Charging System Circuit
The generator features a solid state regulator that is mounted inside the generator. All regulator components are
enclosed into a solid mold, and this unit along with the brush holder assembly is attached to the rear housing. The
regulator voltage is being controlled by ECM under some conditions while driving. Refer to "Generator Control System
Description: in Section 1A".
The generator rotor bearings contain enough grease to eliminate the need for periodic lubrication.
Two brushes carry current through the two slip rings to the field coil mounted on the rotor, and under normal conditions
will provide long period of attention-free service.
The stator windings are assembled inside a laminated core that forms part of the generator frame.
A rectifier bridge connected to the stator windings contains diodes, and electrically changes the stator AC. voltages to
a D.C. voltage which appears at the generator output terminal.
1. Generator with regulator assembly
2. I.C. regulator
3. Stator coil

Battery Inspection

Common Causes of Failure
A battery is not designed to last indefinitely; however, with proper care, it will provide many years of service. If the
battery performs satisfactorily during test but fails to operate properly for no apparent reason, the following are some
factors that may point to the cause of trouble:
• Accessories left on overnight or for an extended period without the generator operating.
• Slow average driving speeds for short periods.
• Electrical load exceeding generator output particularly with addition of aftermarket equipment.
• Defects in charging system such as high resistance, slipping drive belt, loose generator output terminal, faulty
generator or voltage regulator. Refer to "Generator Symptom Diagnosis: ".
• Battery abuse, including failure to keep battery cable terminals clean and tight or loose battery hold down.
• Mechanical problems in electrical system such as shorted or pinched wires.
Visual inspection
Check for obvious damage, such as cracked or broken case or cover, that could permit loss of electrolyte.
If obvious damage is noted, replace battery. Determine cause of damage and correct as needed.
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4. Diode
5. Field coil (rotor coil)
6. Charge indicator light

Diagnostic Information and Procedures

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Charging System:
7. Main switch
8. Battery
9. ECM
S5JB0A1A04004
1J-3
I5JB0A1A0005-01