1948-1952 Shop Service Manual - - Hudson-Essex-Terraplane Club

ELECTRICAL SYSTEM 6 - 17
GENERATOR MOTORIZING DRAW:
After generator is assembled and brushes properly fitted,
the motorizing draw should be checked to assure proper
assembly and alignment.
1. Connect an ammeter and battery in series with the
armature terminal and frame, Figure 11.
2. Ground the field terminal to the frame.
3. Connect a variable resistor in series with the battery and
generator.
4. Connect a voltmeter from the armature to the frame.
5. Generator should operate as a motor with the armature
turning slowly.
6. Adjust voltage to 5 volts and read ammeter.
7. Motorizing draw should be 3.9 to 4.4 amperes. If motorizing
draw is higher, or armature does not turn, worn
bearings, incorrect bearing alignment, short circuits, or
improper assembly is indicated.
GENERATOR CIRCUIT RESISTANCE CHECK:
1. Disconnect battery lead at voltage regulator "B" terminal;
connect the ammeter negative lead to the regulator "B"
terminal and the positive lead to the wire disconnected
from the regulator, Figure 13.
2. Install the negative voltmeter lead to the generator "A"
terminal and the positive voltmeter lead to the battery
negative terminal.
FIGURE 13
3. Connect a jumper between the generator "F" terminal
and a ground
4. Run the engine at 2000 RPM or 20 amperes. The
voltmeter should read not over .8 (tenths) or less.
5. If the resistance is more than .8, make the following
checks with the ammeter connected as in paragraph 1.
A. Remove the positive voltmeter lead from the battery
and Install to the "A" terminal at the voltage regulator.
Ammeter should show less than .1 (tenth).
B. Connect the voltmeter negative lead to the regulator
"A" terminal and the voltmeter positive lead to the regulator
"B" terminal. Ammeter should not show more than
.3 (tenths).
C. Next, connect the voltmeter positive lead to the battery
negative terminal, negative lead to "B" terminal on
regulator. Ammeter should not show more than .5
(tenths).
D. Connect the voltmeter positive leads to engine
ground, negative wire to base of regulator. Ammeter
should show .2 (tenths) or less.
GENERATOR REGULATOR
The generator regulator is a three unit, vibrating type
current-voltage regulator consisting of a cutout relay, a
current limiting regulator, and a voltage regulator.
The cutout relay closes the circuit from the generator to
the battery when the generator voltage reaches 6.3 to 6.8
volts. The cutout relay opens the circuit when the generator
voltage falls below 0 to 5 amperes reverse current.
The voltage regulator unit operates when the generated
voltage rises above the value for which it is set. (See
"Specifications".) The voltage regulator controls the
generator output by inserting resistance in the field
circuit. The voltage regulator contact points open and
close at high frequencies and hold the voltage at a
constant value as long as the resistance of the circuit is
high enough to keep it operating.
The current limiting regulator operates in the same
manner as the voltage regulator an d holds the generator
output to the maximum safe value.
The voltage regulator should he removed for overhaul
or replacement only after other possible cause s of the
trouble have been eliminated.