Troubleshooting
46 Owner’s Manual for MLT6SM/6SK Light Tower
Troubleshooting the Lights
IMPORTANT NOTE: Only a qualified electrician
should troubleshoot or repair electrical problems
occurring in this equipment. Contact Generac Mobile
Products Technical Service at 1-800-926-9768 for
assistance if you have any questions, or if problems
persist.
(000278)
WARNING
Burn hazard. Lamps become extremely hot
while in use. Allow 10–15 minutes for cooling
before handling or lowering mast. Touching a
hot lens or fixture can cause severe burns.
(000187)
WARNING
Electrocution. Potentially lethal voltages are generated
by this equipment. Render the equipment safe before
attempting repairs or maintenance. Failure to do so
could result in death or serious injury.
Problem Possible Cause Solution
Mast lights off,
checking outside
the control box
Light fixture is too hot Allow light to cool 10–15 minutes before restarting.
Faulty lamp connection Verify lamp is tight in the socket.
Lamp broken Inspect for broken arc tube or outer lamp jacket, broken or loose components
in lamp envelope, or blackening/deposits inside tube.
Loose lighting
connections
Inspect the connections inside the mast junction box and each mast light
housing/socket.
Damaged or loose
electrical cord
Inspect the mast electrical cord for damage and check the cord connections
inside the control box.
Faulty fuel filter With engine running and lights off, measure voltage and frequency at the
GFCI receptacle. Voltage should indicate 120VAC ± 5%, and frequency
should indicate 60.7 Hz ± 5%. If frequency and voltage are both low
(<114VAC, <58 Hz), replace the fuel filter.
Faulty generator
capacitor
Measure the capacitance of the generator capacitor. If measurement is
outside rating (as indicated on the capacitor), replace the capacitor.
Mast lights off,
checking inside the
control box
Loose lighting
connections
Inspect the connections inside the control box and inside each ballast box.
Generator output
incorrect
Check the incoming voltage to the ballast by checking the available voltage on
the GFCI receptacle. Incoming voltage should be 120V ± 5V. If voltage is
incorrect, the generator may require service.
Low transformer output The voltage from the transformer should read approximately 400VAC as the
light “strikes” (induces an arc), then drop and slowly rise back up to stabilize at
240-260VAC. On hard wired models, remove the mast junction box cover and
insert the wire probes into the connector blocks for the light and ground. If
proper voltage is not achieved, perform capacitor check to determine if the
capacitor or coil needs to be replaced.
Mast lights on but
the light output is
low
Fixture and/or lens is
dirty
Clean reflective surface inside fixture and both inside and outside surface of
glass lens. Use mild soap and water to clean lens. Other chemicals may have
an adverse effect on the glass.
Lamp worn due to
normal use
Replace lamp.
Damaged or loose
electrical connections
Inspect the mast coil cord, mast junction box, and mast light connections.
Generator output
incorrect
Check the incoming voltage to the ballast. Incoming voltage should be 120V ±
5V. If the voltage is incorrect, the generator may require service.
Low transformer output
The voltage from the transformer should read approximately 400VAC as the light
“strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240–
260VAC. On hard wired models, remove the mast junction box cover and insert
the wire probes into the connector blocks for the light and ground. If proper
voltage is not achieved, perform capacitor check to determine if the capacitor or
coil needs to be replaced.
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