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Turn off the power, remove the bulbs, and remove the cover to expose the ballast. If you see tar leaking from the ballast it is bad and must be replaced. If you see no tar then proceed. Use a multimeter to check for continuity. The yellow and blue wires are the power wires and the white wire is neutral. With the meter set to ohms check between the yellow wire and white wire at the end where it connects to the light. If you get no reading the ballast is bad. Now check the other side where power is coming in. No reading and the ballast is bad. If you get a reading at both ends it is good. Check for loose wires.

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Q: How do you test a ballast for fluorescent fixture?
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Related questions

What is a pin based fluorescent light fixture?

A pin based fluorescent light fixture is the type of fixture that takes fluorescent tubes. On each end of the fluorescent tubes there are contact pins. These pins are used to hold the tube in the fixture and to supply the voltage to the tube from the fixture's ballast.


How much power does a fluorescent fixture use with no tubes installed For example a switched on 8' fixture with a single tube with an old ballast.?

Depends if ballast is in fixture and switch is on. Several watts if new ballast and perhaps 15 watts for old ballasts....


Can you use a 65 watt fluorescent bulb in a metal halide light fixture?

No, the ballast's output is not matched to operate a fluorescent bulb.


If I remove two of the four lamps in my fluorescent fixture to save electricity should they be on the same ballast?

Yes


Does a fluorescent ballast use power when no bulbs are in the fixture?

Yes, there is an excitation current that flows through the primary side of the transformer which is located in the magnetic ballast's casing.


How many volts needed to run a fluorescent light?

The voltage of your area is what determines the operating voltage of all equipment. Equipment from other countries usually has to use a transformer to get the correct voltage. The voltage on a fluorescent fixture is printed on the ballast of the fixture. See if the voltage on the ballast matches the supply voltage of the system that you are going to use to operate the fixture.


How many volts should I be reading at a fluorescent bulb?

The voltage present on the secondary side of the ballast (transformer) varies as to the type of fluorescent tube or bulb that is in the fixture. The voltage will always be higher that the applied line voltage that supplies the ballast.If the fluorescent bulb screws into a lamp type of fixture, then there is no way to measure the voltage at the bulb as the tube and ballast are a combined sealed unit.


Where is Fluorescent light wiring diagram?

For information about fluorescent tube lights see the answers to the Related questions and the Related link shown below.


How do I wire T8 multi volt lights fixtures to 220 volts?

The terminology T8 suggests to me that the fixture is a fluorescent fixture. These types of tube fixtures need a ballast to make the tubes ignite. If you are trying to operate this type of fixture on 220 volts, you will need a ballast that requires a 240 volts input voltage source.


If one fluorescent bulb is bad will all 4 fluorescent bulbs not work in a fixture with one ballast?

It is possible, depending on the ballast wiring to the tubes. Some ballast units actually contain multiple independent ballasts that would be hooked to individual tubes or pairs of tubes independently. Some ballasts may control all the tubes in one fixture and when one tube fails the others either go out or flicker badly.


How many watts does a HO 8 foot T-12 fluorescent lamp fixture draw?

Look on the ballast inside of the fixture. There is an amperage and a voltage on the ballast label. Use this equation to find the wattage. W = I x E, Watts = Amps x Volts. This will give you the answer that you are looking for.


Your kitchen lights won't turn on after replacing the u-shaped tubes. What could be the problem?

If the fluorescent tubes work in a different fixture then the ballast may be defective.