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Fig. 47, WIRING DIAGRAM
ELECTRICAL SYSTEM
WITH
BELT DRIVEN ALTERNATOR
AND
SOLENOID STARTING
12 VOLT
SOLENOID
~
C~ ~ SPARK
~ AUTOMATIC ~--~.-~"
~
~
~CH
~ (Optionol) I ~ DISTRIBUTOR
term.
term:
j
SWITCH
~
~
+~ - HI- TEMPERATURE
AMMETER ~l
/~
1~
~
I
SAFETY SWITCH
side of ~meter (neg. term.).
For Equip-
~~~
COl L
merit
Solenoids~ at Solenoid Switch-
~
_ ~
B~te#y
side.
BELT DRIVEN % REGULATOR
ALTERNATOR
30 AMP FLYWHEEL ALTERNATOR
An improved 30 amp flywheel alternator
system is now
available as an option on VG4D engines. This improved 30
amp system is capable of higher output at lower engine
speeds over the 25 amp flywheel alternator system.
This new 30 amp system can be easily recognized by the
single regulator-rectifier module. The combination regula-
tor-rectifier
(YJ70) is mounted to the cylinder shroud
the VG4D. The Y J70 must be securely mounted to a
location that will allow cooling of the unit.
In addition to a new style regulator-rectifier, a new stator
(YB84) is used for this 30 amp system. Also, the magnet
ring in the flywheel is different than the 25 amp system. In
order to change a VG4D from the 25 amp system to this
improved 30 amp system, the regulator-rectifier,
stator,
flywheel, wiring and cylinder shroud must be changed.
30 AMP FLYWHEEL ALTERNATOR TESTING
When testing a charging system which uses the YJ-70
rectifier-regulator module, the following items should be
checked:
1. That the charging system is properly wired.
2. That all connections are clean and tight.
3. That the battery is in good condition.
The testing should begin by testing the A.C. voltage output
of the stator where the 2 leads attach to the Y J-70. Discon-
nect the stator leads from the Y J-70 and hook them up to a
volt-ohm meter. Use the A.C. voltage scale and the reading
should be between 20 and 50 volts A.C. depending upon the
engine rpm. (The faster the engine speed, the higher the
A.C. voltage should be.) This test checks the stator and
magnet ring. If the charging system passes all the previ-
ously mentioned checks, then the Y J-70 module can be
checked as shown below. Use a good quality ohm meter.
All readings are done on the RX 100 scale. Do not attempt
to use the DF83 analyzer or any other type continuity
tester.
Ohmeter Leads
Module Terminals
Components Under Test and Indication
i. Neg.(-)
~
~
B+
Diode Assembly Insulator, Power SCR's.
POS.(+)
!
~ Case
Meter should indicate no continuity. (Infinity)
2.
Neg.(-)
I
> B+
~ Power Diode Forward Bias Test. Meter
Poe.(+)
!
>Each AC Terminal
ehould indicate continuity but ehould not
~ indicate a complete short-c~rcult.
i
(Some Resistance)
3. Pos.(+)
~
> B+
Regulator Control Circuitry. Meter should
Neg.(-)
[
> Case
indicate no less than 7500 ohms and may read
I
as high as approxlmately 30,000 ohms.
4. Poe.(+)
!
> Case
Power SCR's. Meter should indicate no
Neg.(-)
j
>Each AC Termina~ Continuity.
(Infinity)
5.
poe.(+)------~.'S+
Neg.(-)-------~Each AC Terminal
Power diode reverse bias test. No continuity.
A very high resistance (50,000 - 1,000,000 ohms)
~ay be observed if measured on the high
resistance scale of an Ohmmeter.
36
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Troubleshooting
