Section 05 ELECTRICAL
Sub-Section 07 (TESTING PROCEDURE)
05-07-14
VOLTAGE REGULATOR INSPECTION
A faulty voltage regulator is often responsible for
frequent burned bulbs.
TESTING PROCEDURE
The regulator ground must be checked to ensure
the circuit is complete. If necessary, connect a
good ground wire from the regulator to the en-
gine.
A) Quick Test Without Voltmeter
If a voltmeter is not available, a visual test can be
performed with satisfactory results.
Disconnect
all
lights and electric equipment.
While engine is running, disconnect and connect
regulator connector several times checking for a
spark.
A spark on regulator terminal indicates a good and
working regulator.
B) Voltmeter Test
NOTE:
Use a voltmeter able to read alternat-
ing current (AC). For accurate reading, use a
RMS voltmeter.
Connect a wire of the voltmeter to a BLACK/YELLOW
wire.
Connect the other wire of the voltmeter to a YEL-
LOW wire.
Lift the rear of vehicle and support with a mechan-
ical stand.
Start the engine at an idle without opening the
throttle.
Slowly open the throttle and accelerate the en-
gine to increase the RPM.
If the meter reads over 15 volts, the regulator is
defective and must be replaced.
NOTE:
Whatever the voltmeter type used
(peak voltage or RMS) the voltage must not
exceed 15 V (a defective regulator will allow volt-
age to exceed 15 V as engine RPM is increased).
-
CAUTION
Never run an engine with a faulty or inoper-
ative voltage regulator. This could damage
the DUCATI CDI module.
-
CAUTION
Do not perform this test on engines that
have a DUCATI CDI system.
◆
WARNING
Ensure the track is free of particles which
might be thrown out while track is rotating.
Keep hands, tools, feet and clothing clear of
track. Ensure no-one is standing in close
proximity to the vehicle.
-
CAUTION
Do not increase the RPM so the voltage ex-
ceeds 15 V as the bulb(s) will burn.
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