Belt Drive Alternator; 30 Amp Flywheel Alternator; Stator Ground; Stator Continuity - Wisconsin VH4D Repair Manual

Test 7.0 STATOR GROUND
Like the Regulator, the YB 81 and YB 82 Stators must
be grounded. Stator ground can be checked with any
type continuity device.
TEST TESTER
NO. RED LEAD
To Stator
I
Black Lead
TESTER
RESULT
BLACK LEAD
To Ground
To Other
To Ground
2
Black Lead
DF 83- Light On
DF81-Light On
VOM- Continuity
Test 7.3 STATOR RUNNING VOLTAGE
With the engine stopped, unplug all connectors be-
tween modules and stator. Start the engine and run at
operating speed. Perform the following tests with an
AC voltmeter:
TEST
NO.
METER METER STATOR
RED LEAD BLACK LEAD DEFECTIVE IF:
To Ground
To Stator
Black Lead
To Other
Stator
Black Lead
To Ground
Either Reading
is O
or
Readings Vary
more than 10%
Test 7.1 STATOR CONTINUITY
This test should be performed after 7.0 stator ground
test. Use continuity equipment such as DF81 Flash-
lite or VOM. ResuJ'ts other than specified indicate a
defective stator.
TEST
NO.
I
2
3
TESTER TESTER
RESULT
RED LEAD
BLACK LEAD
To Ground
To Stator
Red Lead
To Stator
To Ground
Black Lead
To Ground
To Other
Black Lead
DF 81 - Light On
VOM o Continuity
Test 7.2 CONTINUITY with DF 83 Analyzer
¯ . 4&- "-°
Stator
Ground
-
Black Lead
Stator Other
Black Lead
Ground
-
Ground -
Ground
Ground
Stator
Red Lead
Stator
Black Lead
Stator Other
Black Lead
On
On
On
On
On
YBSI
YB82
ERMINAL
PLUG
If light indication is other than shown, stator is de-
fective. If stator checks out good, perform voltage
test 7.3.
BELT DRIVEN ALTERNATOR
The t2 vott- 37Amp Automotive type Altezrm~ is optionally available
in place of the Flywheel Alternator. No maintenance or adjustments are
required other thim periodically checking for loose, broken or dirty
wire-terminal connections, and for proper drive belt tension. Bearings
are pre-lubricated, no additional lubrication is necessary. The Regula-
tor is an all electronic transistorized devise, therefore no mechanical
contacts or relay adjustments are necessary for voltage regulation.
The alternat~ is wired into the engine electrical system per Fig. 45.
IMPORTANT
This is a Negative Ground system. Charging components will be
damaged if grounded wrong in connecting or jumping batteries.
Handle battery carefully to prevent acid
/~ WARNING
bums. Avoid sparks near battery - gas given
off by battery is explosive
PRECAIfrIONS to be exercised in the use of belt driven alternator:
1. Observe proper polarity when installing battery; negative battery
terminal must be grounded. Revere polarity will deslroy the rectifier
diodes in alternator.
2. As a precautionary measure, disconnect ground battery terminal when
charging batl~n'y in vehicle. Connecting charger in reverse will destroy
the rectifier diodes in the alternator.
3. DO No~ under any circumstances, short the field terminal of the
alternator to ground, as permanent damage to the regulator rmy occur.
4. DO Not, remove the alternator from the vehicle without first discon-
necting the grounded battery cable.
5. Do Not, operate engine with battery disconnected, or disconnect the
alternator output lead while the alternator is operating, as aarnping
effect of the battery will be lost. The voltage will rise to an extreme value
aud permanent damage Io the regulator may occur.
6. Do No~ disconnect the voltage regulator while the alternator is
operating, because the large voltage transient that occurs when discon-
nection takes place may damage the regulator.
7. Cautioil: Output wires from Alternator to Ammeter, and from Amme-
ter to battery terminal on starting solenoid must be of sufficient size for
charging 37 amps. Use Nc~ 10 gage stranded wire, or larger.
30 AMP FLYWHEEL ALTERNATOR
An improved 30 amp flywheel alternator system is now available as an
option ou Vtt4D engine~ This improved 30 amp system is capable of higher
output at lower engine speeds over the 25 amp flywheel alternator systean.
This new 30 amp system can be easily recognized by the single regulator:
rectifw-r module. The combination regulator-rectifier (YJ70) is mountea
to the cylinder shroud on the VH4D. The Y J70 must be securely mounted
32