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

ENGINE TUNE-UP 2 -15
FIGURE 22
CAUTION: The engine MUST NOT be run for more than
a few seconds while making the above test, due to the
danger of burning out the generator. All lights and accessories
must be turned off during the above test to prevent
damage due to excessive voltage.
NOTE: All generator tests should be made with the generator
circuit at normal operating temperature. If the above
test is made with a resistor type tester, the resistance knob
must be turned to the out position.
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 23.
2. Install the negative voltmeter lead to the generator "A"
terminal and the positive voltmeter lead to the battery
negative terminal.
3. Connect a jumper between the generator "F " terminal
and a ground.
and a ground.
4. Run the engine at 2000 R.P.M. 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.
CIRCUIT BREAKER CHECK:
To determine whether the circuit breaker points are
closing at the proper generator voltage and also whether
they will open upon deceleration by amperage from the
battery proceed as follows:
1. Disconnect the battery wire at the voltage regulator "B"
terminal and connect the ammeter between the voltage
regulator "B" terminal and the wire disconnected, Figure
24.
FIGURE 24
FIGURE 23
2. Connect voltmeter positive lead to base of regulator and
negative voltmeter le ad to the generator "A" terminal.