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Troubleshooting Guide
25 Amp Battery Charging System
*NOTE: Zero ohmmeters and voltmeters on each scale to ensure accurate readings. Voltage tests should
be made with engine running at 3600 RPM - no load. Battery must be fully charged.
Problem
Test
Conclusion
1 .
Insert an ammeter In B+ lead from rectifier- 1.
If charge rate Increases when load Is applied,
regulator. With engine running at 3600 RPM
the charging system Is OK and battery was
and B+ lead connected, measure the volt-
fully charged.
age from B+ (at terminal on rectifier-regula-
If charge rate does not Increase when load Is
tor) to ground using a DC voltmeter.
applied, test stator and rectifier-regulator
If voltage Is 13.8 volts or more, place a
(tests 2 and 3).
minimum load of 5 Amps • on battery to re-
duce voltage. Observe ammeter.
*NOTE: Turn on lights, If 60 watts or more.
Or place a 2. 5 1 00 ohm, watt resistor
across battery terminals.
No
2.
Remove connector from rectifier-regulator.
2.
If voltage Is 28 volts or more, stator Is OK.
Charge
With engine running at 3600 RPM, measure
Rectifier-regulator Is faulty. Replace the recti-
To
AC voltage across stator leads using an AC
tier-regulator.
Battery
voltmeter.
If voltage Is less than 28 volts, stator Is prob-
ably faulty and should be replaced. Test stator
further using an ohmmeter (test 3).
3a. With engine stopped, measure the
3a.
If resistance Is 0. 064/0.096 ohms, the stator Is
resistance across stator leads using an
OK.
ohmmeter.
If resistance Is Infinity ohms, stator Is open.
Replace stator.
3b. With engine stopped, measure the resls-
3b.
If resistance Is Infinity ohms (no continuity) the
tance from each stator lead to ground using
stator Is OK (not shorted to ground).
an ohmmeter.
If resistance (or continuity) Is measured, the
stator leads are shorted to ground. Replace
stator.
1.
With engine running at 3600 RPM, measure
1 .
If voltage Is 14.7 volts or less the charging
Battery
voltage from B+ lead to ground using a DC
system Is OK. The battery Is unable to hold
Continuously
voltmeter.
charge. Service battery or replace as neces-
Charges At
sary.
High Rate
If voltage Is more than 14.7 volts, the rectifier-
regulator Is faulty. Replace rectifier-regulator.
8.16
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