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TM 10-3930-671-24
6.8. Alternator Maintenance
Troubleshooting Guide ................................................................... F-261
Alternator Maintenance Precautions .............................................. F-262
Alternator Inspection ...................................................................... F-262
Troubleshooting Procedures .......................................................... F-262
Alternator Installation...................................................................... F-264
Altemator Mounting Parts - GPX Model - TMD 27 [2.7L] Engine... F-265
Troubleshooting Guide
Problem
Probable Cause
Corrective Action
1
Battery undercharged
1
Defective cables, dirty posts,
1
Check, clean, repair or replace
a) ammeter (if used) indicates
corroded terminals, etc. as needed.
constant discharge
2.
Loose or broken belt
2.
Check belt.
b) indicator lamp remains on
3.
Worn or broken brushes
3.
Replace brush assembly.
4.
Defective alternator system
4.
Repair or replace alternator.
2.
Battery undercharged
1.
Indicator lamp burned out or
1.
Check bulb & harness.
a) indicator lamp OFF with key
defective wiring harness.
ON and engine stopped.
2.
Plug at rear of altemator.
2.
Check plug to ensure it is
(Normal condition is lamp ON)
fully seated.
3.
Broken brush
3.
Replace brush assembly.
4.
Defective alternator system
4.
Replace regulator.
3.
Battery overcharges
1.
Plug at rear of alternator or
1.
Repair or replace components.
a) excessive use of water
wiring harness.
b) ammeter (if used) shows
2.
Defective alternator system.
2.
Repair or replace regulator.
constant excessive charge.
c) voltmeter indicates greater
than 14.5 volts (connected across
battery with no load) with engine
idling.
4.
Battery charges at idle,
1.
Slipping belts.
1.
Check belts and adjust tension
but discharges under load
or replace, as necessary.
conditions
2.
Altemator defective
2.
Repair or replace alternator.
5.
Indicator lamp glows slightly
1.
Defective diode trio
1.
Replace diode trio.
under moderate load; battery
appears charged.
Also refer to: Section 6.9, Prestolite Altemator Service Manual.
F-261
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