magnetic field changes. These surges are
partially dissipated by the two resistors, thus
preventing excessive arcing at the contact
points.
Regulator Polarity
Some regulators are designed for use with
negative grounded batteries while other regula-
tors are designed for use with positive grounded
batteries. Using the wrong polarity regulator
on an installation will cause the regulator
contact points to pit badly and give very short
life. As a safeguard against installation of
the wrong polarity regulator, regulators de-
signed for positive grounded systems have
copper plated current and voltage regulator
armatures while regulators for negative
grounded systems have cadmium plated armatures.
Regulator Maintenance
Mechanical checks and adjustments (air gaps,
point spacing) must be made with battery
disconnected and regulator preferably off the
vehicle.
CAUTION:
The cut-out relay contact points
must never be closed by hand with the
battery connected to the regulator. This
would cause a high current to flow
through the units which would seriously
damage them.
Electrical checks and adjustments may be made
either on or off the vehicle. The regulator must
always be operated with the type generator for
which it was designed.
The regulator must be mounted in the operat-
ing position when electrical settings are
checked and adjusted, and it must be at
operating temperature.
After regulator removal for any tests or
adjustments, the generator on the vehicle must
be repolarized after leads are connected but
before the engine is started as follows:
Repolarizing Generator
After reconnecting leads, momentarily connect
a jumper lead between the "Gen" and "Bat"
terminals of the regulator. This allows a
momentary surge of current to flow through the
generator which correctly polarizes it. Failure
to do this may result in severe damage to the
equipment since reversed polarity causes vibra-
tion, arcing, and burning of the relay contact
points.
Quick Checks of Generator and Regulator
In analyzing complaints of generator-regulator
operation, any of several basic conditions may
be found:
FULLY CHARGED BATTERY AND LOW CHARGING RATE:
This indicates normal generator- regulator
operation. Regulator settings may be checked as
outlined in the following sections.
FULLY CHARGED BATTERY AND A HIGH CHARGING RATE:
This indicates that the voltage regulator is
not reducing the generator output as it should.
A high charging rate to a fully charged battery
will damage the battery, and the accompanying
high voltage is very injurious to all electrical
units.
This operating condition may result from—
Improper voltage regulator setting.
Defective voltage regulator unit.
Grounded generator field circuit (in either
generator, regulator, or wiring) .
Poor ground connection at regulator.
High temperature which reduces the resistance
of the battery to charge so that it will
accept a higher charging rate even though the
voltage regulator setting is normal.
If the trouble is not due to high temperature,
determine the cause of trouble by disconnect-
ing the lead from the regulator "F" terminal
with the generator operating at medium speed.
If the output remains high, the generator
field is grounded either in the generator or
in the wiring harness. If the output drops
off, the regulator is at fault and should be
checked for a high voltage setting or grounds.
LOW BATTERY AND HIGH CHARGING RATE: This is
normal generator-regulator action.
Regulator settings may be checked as outlined
in the following sections.
LOW BATTERY AND LOW OR NO CHARGING RATE: This
condition could be due to—
Loose connections, frayed, or damaged wires.
Defective Battery.
High circuit resistance.
Low regulator setting.
Oxidized regulator contact points.
Defects within the generator.
If the condition is not caused by loose
connections, frayed, or damaged wires, pro-
ceed as follows:
To determine whether the generator or regula-
tor is at fault, momentarily ground the "F"
terminal of the regulator and increase
generator speed. If the output does not
increase, the generator is probably at fault
and it should be checked. If the generator
output increases, the trouble is due to:
A low voltage (or current) regulator setting.
Oxidized regulator contact points which
insert excessive resistance into the genera-
tor field circuit so that output remains low.
Generator field circuit open within the
regulator at the connection or in the
regulator winding.
BURNED RESISTANCES, WINDINGS, OR CONTACTS:
These result from open circuit
operation or high resistance in the charging
circuit. Where burned resistances, windings, or
contacts are found,
E L E C T R I C A L
15
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