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SECTION 8
ELECTRICAL SYSTEM AND COMPONENTS
Troubleshooting Guide
15/25 amp Battery Charging Systems
NOTE:
Zero ohmmeters 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. Trace B+ lead from rectifier-regulator to key
switch, or other accessible connection. Discon-
nect it from switch or connection. Connect an
ammeter from loose end of B+ lead to positive
terminal of battery. Connect DC voltmeter from
loose end of B+ lead to negative terminal of
battery. With engine running at 3600 RPM, read
voltage on voltmeter.
If voltage Is 13.8 volts or more, place a mini-
mum load of 5 amps* on battery to reduce volt-
age. Observe ammeter,
*NOTE: Turn on lights, if 60 watts or more. Or
place a 2.5 chm, 100 watt resistor
1. If voltage is 13.8-14.7 and charge rate in-
creases when load is applied, the charging sys-
tem is OK and battery was fully charged.
If voltage is less than 13.8 or charge rate does
not increase when load is applied, test stator
(Tests 2 and 3).
N
If voltage is 28 volts or more, stator is OK. Rec-
tifier-regulator is faulty. Replace the rectifier-
regulator.
If voltage is less than 28 volts, stator is probably
faulty and should be replaced. Test stator fur-
ther using an ohmrneter (Test 3).
3a. If resistance is .064/0.2 ohms, the stator is OK.
If resistance is infinity ohms, stator is open.
Re-
place stator.
3b. if resistance is infinity ohms (no continuity), the
stator is OK (not shorted to ground).
If resistance (or continuity) is measured, the sta-
tor leads are shorted to ground.
Replace stator.
across battery terminals.
NO
2. Remove connector from rectifier-regulator.
CHARGE
With engine running at 3600 RPM, measure AC
voltage across stator leads using an AC
BATTERY
voltmeter,
3a. With engine stopped, measure the resistance
across stator leads using an ohmmeter.
3b. With engine stopped, measure the resistance
from each stator lead to ground using an
ohmmeter.
1. Perform same test as Step 1 above.
BATTERY
CONTINUOUSLY
CHARGES AT
HIGH RATE
. If voltage is 14.7 volts or less the charging sys-
tem is OK. The battery is unabie to hold
charge. Service battery or replace as
necessary.
If voltage is more than 14.7 volts, the rectifier-
regulator is faulty. Replace rectifier-regulator.
8.9
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