Component Testing and Adjustment 7-5TP-5648 8/93
Voltage Regulator
Test Procedure
1. Disconnect P5 of wiring harness from P1 on
voltage regulator. (See Figure 7-1.)
2. Connect components as shown in Figure 7-4.
3. Turn variable transformer setting to zero. Plug in
variable transformer. Plug in power source to
terminals 5 and 6.
4. Turn variable transformer on. Turn SPST switch
on. Slowly increase variable transformer voltage.
The lamp should go on. Continue to increase
variable transformer voltage and when the preset
voltage is reached (observe voltmeter) the lamp
will turn off and continue to stay off as voltage is
further increased. The preset voltage is
determined by the setting of the Volts adjustment
pot. on the voltage regulator. The preset voltage
for a 120/240 Volt system is 240 Volts, for a
110/220 Volt system it would be 220 Volts, etc. If
the voltage regulator functions as described, the
voltage regulator is okay.
If the lamp does not turn on, turn the voltage
regulator Volts adjustment pot. to the approximate
midpoint and repeat test. If the lamp fails to go on
after adjusting the Volts pot., replace the voltage
regulator. A voltage regulator testing bad as
described would cause a generator to have a
no/low voltage condition.
If the lamp fails to turn off as voltage is increased,
turn the voltage regulator Volts adjustment pot. to
the approximate midpoint and repeat test. If the
lamp fails to go off after adjusting the Volts pot.,
replace the voltage regulator. A voltage regulator
testing bad as described would cause a generator
to have a high voltage condition.
5. Turn variable transformer to zero and unplug AC
cord. Turn SPST switch off and unplug cord.
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