50
TEST NO. 4 (BATTERY ALWAYS CHARGING AT HIGH RATE)
Check B+ to ground voltage with D.C. voltmeter.
1. 2500 RPM: Voltage over 14.7 volts. 1. Regulator not functioning.
2. 3000 RPM: Voltage over 14.7 volts. 2. Regulator not functioning.
3. 3600 RPM: Voltage over 14.7 volts. 3. Regulator not functioning.
4. 2500 RPM: Voltage under 12.0 volts. 4. Battery charge low. Alternator
and Regulator System okay.
Check battery.
5. 3000 RPM: Voltage under 13 volts. 5. Battery charge low. Alternator
and Regulator System okay.
Check battery.
6. 3600 RPM: Voltage under 14.7 volts. 6. Battery charge low. Alternator
and Regulator System okay.
Check battery.
TEST NO. 5 (BATTERY BOILING OR FUMING)
Check B+ to ground voltage with D.C. voltmeter.
1. If over 14.7 volts. 1. Regulator not functioning.
Visual check for overfilling. Overfilled battery may appear to
fume due to expansion.
Before performing the following tests, see page 48, A through F.
TEST NO. 1 (NO CHARGE TO BATTERY)
NOTE: Tests must be followed in their order of listing. EXAMPLE: Test No. 1
must be completed before proceeding to Test No. 2. Replace any defective
part.
With battery connected check B+ to
ground voltage with D.C. voltmeter.
1. Place load (head lights) on battery
to reduce battery voltage to below
12.5 volts. (This may take a few
minutes.)
2. Start engine. Run at 2500 RPM, 3000
RPM and 3600 RPM with same load
as above.
a. If voltage increases. a. System okay - Battery was charged
fully.
b. If voltage does not increase. b. Check for defective stator or
regulator system. Tests No. 2
and No. 3.
20 AMP. ALTERNATOR TESTS
TERMINAL WIRE
D.C.
VOLTMETER
LEADS
RECTIFIER-REGULATOR
TEST SET-UP ON 20 AMP SYSTEMS WITH
EXTERNAL REGULATOR-RECTIFIER
GREEN
YELLOW
YELLOW
YELLOW
YELLOW
GREEN
GREEN
RED
RED
FUSE
SWITCH
RECT. - REG.
R
B
M
D.C.VOLTMETER
BATTERY
TEST SETUP ON NEW 20 AMP. SYSTEMS WITH RECTIFIER-
REGULATOR IN BLOWER HOUSING. TEST VALUES SAME
AS ORIGINAL 20 AMP. SYSTEM.
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