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Diagnostics - Metal Halide Fixtures
For light tower trailers equipped with metal halide bulbs,
if a bulb does not light within about 10 minutes after the
engine has started, determine whether the bulb is burnt
out or if the ballast has failed.
The easiest way to determine this is to replace the bulb
with a new one that you know works. If the new bulb does
not light, the ballast will need to be replaced.
Replacing Metal Halide Light Bulbs
WARNING
Burn Hazard
The light fixtures become extremely hot during use.
Always use caution and heat-resistant glove when
handling the lights or allow the lights to sufficiency cool
down before handling.
See Specifications for the correct light bulb for your light
tower trailer.
To replace the light bulb:
1. Turn off the lights and shut down the engine.
2. If the light tower is in the raised position, lower the
light tower.
3. Allow 20 minutes for the lamp fixtures and bulbs to
cool.
4. Loosen the lens channel screws (A, Figure 33) and
remove the lens channel (B, Figure 33).
5. Remove the silicone gasket (C, Figure 33) and lens
(D, Figure 33).
6. Remove the support clip screws (E, Figure 33) and
support clip (F, Figure 33).
7. Carefully remove the old bulb (G, Figure 33). Properly
dispose of the bulb according to federal, state, local
or province regulations.
8. Clean the reflector (H, Figure 33) and lens.
9. Install the correct replacement bulb. See
Specifications.
10. Install the support clip and screws.
11. Install the silicone gasket and lens. Replace if worn
or damaged.
12. Install the lens channel and screws.
13. Test the new bulb to ensure proper operation
28
33
G
D
B
C
A
Checking the Ballast
DANGER
Shock Hazard
Capacitors are capable of discharging high voltage that
will result in death or serious injury. Always turn off the
light switch, shut down the engine and allow capacitors
time to discharge before servicing.
The ballast consists of a ballast transformer, and a
capacitor. Generally, the capacitor will be the cause of a
ballast problem.
To check whether the ballast transformer or capacitor has
failed:
1. Turn off the lights and shut down the engine.
2. If the light tower is in the raised position, lower the
light tower.
3. Allow capacitor time to discharge.
4. Determine which ballast corresponds with which
fixture.
5. Remove the screws (C, Figure 34) and cover (D,
Figure 34) from the ballast box corresponding to the
affected fixture.
Note: Figure 34 shows the items for light fixtures 1
and 2. Other fixtures are similar.
6. Check the transformer:
A. Start the engine and turn on the light.
B. Using an AC voltmeter capable of safely
measuring up to 1,000 volts, connect one
probe of the voltmeter to the ground screw
where the green wire is connected (A, Figure
34), and the other probe to the input side (white
wire labeled "Cap") of the capacitor (B, Figure
34).
H
F
E
B
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