RECTIFIER
STATOR
ASSY.
I
TO
BATTERY
SCREEN
BOLT
FLYWHEEL
ON
PRESSURE COOLE
'ACU-FLO
ENGINE
\
FLYWHEEL
ALTERNATORROTOR
(PART OF FLYWHEEL
ASSY.)
FIGURE
34.
20
AMP
SYSTEM
TESTING
OR
SERVICING
Keep these points in mind when testing or servicing the
flywheel alternator:
1. Be sure engine
is
being run long enough and fast
enough to recharge battery after each start Alter-
nator output is reduced in direct proportion to
engine rpm. Also, power required for accessories
reduces power available
to
recharge battery.
2.
Be sure output control plug (connector) is inserted
properly. Plug must bottom in receptacle-elim-
inates any resistance due to a poor connection.
Keep clean and tight.
3.
Make sure alternator stator leads are not shorted
together.
4.
Be sure regulator-rectifier output control has a
good ground connection. Mating surface for mount-
ing must be clean and fasteners tightened properly.
5.
Never reverse the battery leads.
6.
Charging system tests require a fully charged
battery.
20
Amp
Synchro
System
The
20
amp flywheel alternator systems use a separate
regulator and a separate rectifier, Figure
34.
Testing:
For testing this system, use a voltmeter-
ohmmeter such as a Simpson 270. Various alternator
problems with individual test procedures are listed in
Table
2.
TABLE 2.
TESTING
SYNCHRO
20
AMP
SYSTEM
TEST
Battery voltage
-
unit
not running
Battery voltage with
unit running at 1800
rpm or more
VALUE
AC voltage from stator
with plug disconnected
and unit running at
approximately
1800
rpm
Ohmmeter reading at plug
when checking
two
AC
stator leads
-
unit not
running
Resistance values
(Ohms)
are as
follows
between
wire
pairs
1
BLACK
I
.S
-
17
n
1.8-
2.2n
I
t
BLACK
1.3-
1.5a
12 Volts DC
14.2
-
14.8VDC
depending on
charge condition
of battery
23
VAC
minimum*
Black to Black
'
-
48
VAC
maximum
at
3600
rpm.
31
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