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2. Install the negative voltmeter lead to the gener-
ator "A" terminal an d the positive voltmeter
lead to the battery negative terminal.
3. Connect a jumper between t he generator "F"
terminal and a ground.
4. Run the engine at a speed to deliver 20amperes.
The voltmeter should not read more or less than
8 (tenths) of a volt.
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 volt- m e t e r
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 en g
in e 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 decelera-
tion by amperage from the battery proceed as
follows:
FIGURE 13
ENGINE TUNE-UP 16
1. Disconnect the battery wire at the voltage regu-
lator "B" terminal and connect the ammeter
between the voltage regulator " B" terminal and
the wire disconnected, Figure 13.
2. Connect voltmeter positive lead to base of
regulator and negative voltmeter to the genera-
tor "A" terminal.
3. Set carburetor adjusting screw so engine will
idle at approximately 400 R.P.M.
4. Increase engine R.P.M. by carefully rot a t in g
the accelerator bellcrank while watching the
voltmeter.
NOTE: When the voltmeter reads at any point
between 6.3 to 6.8 volts the circuit breaker
points should close and the ammeter will show
the generator is charging. When the circuit
breaker points close, a slight drop back of the
voltmeter needle will be noticed. In the eve nt
the drop back is not evident, slightly discharge
the battery and recheck.
5. Next, slowly reduce engine speed and watch the
ammeter.
NOTE: When the ammeter reads 4 to 6 am-
peres, negative side of zero, the circuit breaker
should open and the ammeter needle will return
to zero. Perform operation 4 and 5 several times
until you are sure your readings are correct.
6. Proper adjustments can be made by bending the
spring hanger on the circuit breaker. Increasing
the tension raises the opening voltage; decreas-
ing the tension lowers the opening voltage.
Contact gap must not be less than .015".
VOLTAGE REGULATOR CHECK
1. Disconnect the battery wire at the voltage regu-
lator "B" terminal and connect the test ammeter
between the voltage regulator "B" terminal and
the wire disconnected, Figure 14.
2. Connect the voltmeter positive lead to the regu-
lator base and the negative lead to the regulator
"B" terminal.
3. Run engine at approximately 2,000 R.P.M.
4. Vary resistance until ammeter reads 19 amperes
and then check the voltmeter reading which
should be 7.25 volts. (Hot, cover in place.)
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