7.13
Section 7
Electrical System and Components
7
Troubleshooting Guide 9 or 15 amp Regulated Battery Charging System
NOTE: Zero ohmmeters on each scale to ensure accurate readings. Voltage tests should be made with engine
running at full throttle - no load. The battery must be fully charged.
Problem Test Conclusion
1. Trace B+ lead from rectifier-regulator to key
switch, or other accessible connection.
Disconnect 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. See Figure 7-11.
With engine running in the fast position, read
voltage on voltmeter.
If voltage is 13.8 volts or more, place a
minimum load of 5 amps* on battery to
reduce voltage. Observe ammeter.
*NOTE: Turn on lights, if 60 watts or more.
Or place a 2.5 ohm, 100 watt
resistor across battery terminals.
1. If voltage is 13.8-14.7 and charge rate
increases when load is applied, the charging
system 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).
2. Remove connector from rectifier-regulator.
With engine running in the fast position,
measure AC voltage across stator leads using
an AC voltmeter.
2. If voltage is 28 volts or more, stator is OK.
Rectifier-regulator is probably faulty. Verify with
Rectifier-regulator tester KO3221.
If voltage is less than 28 volts, stator is
probably faulty and should be replaced. Test
stator further using an ohmmeter (Test 3).
No
Charge
to
Battery
3a. With engine stopped, measure the resistance
across stator leads using an ohmmeter.
3a. If resistance is 0.1/0.2 ohms, the stator is OK.
If the resistance is infinity ohms, stator is
open. Replace stator.
3b. With the engine stopped, measure the
resistance from each stator lead to ground
using an ohmmeter.
3b. If the resistance is infinity ohms (no
continuity), the stator is OK (not shorted to
ground).
If resistance (or continuity) is measured, the
stator is shorted to ground. Replace stator.
1. If the voltage is 14.7 volts or less the charging
system is OK. The battery is unable to hold a
charge. Service battery or replace as
necessary.
If voltage is more than 14.7 volts, the
rectifier-regulator is faulty. Replace
rectifier-regulator.
1. Perform same test as step 1 above.
Battery
Continuously
Charges at
High Rate
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