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How to test a light ballast?

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Inspect the ballast closely to see if there is any leakage. If you see any indication of such, there's no need to continue with testing; the ballast will have to be replaced. Tip: You can continue this testing process after you have a new ballast installed if you feel the need. read more

The ballast provides enough voltage to start the fluorescent bulbs, and once they are started, it quickly lowers the current to produce just enough electricity to produce a steady light source. Without the ballast, a fluorescent bulb would attach directly to 120-volt current and quickly burn out the bulb. read more

To test the fluorescent light ballast, turn off the circuit breaker for the fluorescent fixture, and remove the fixture's lens cover. Afterward, remove the bulbs from the fixture. Next, take the ballast cover from the fixture, and replace the ballast if it appears leaking, burned or swollen. read more

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How to Test the Ballasts in Fluorescent Light Fixtures | eHow
Source: ehow.com