Hi all,

Have 2 light fixtures in a garage, with 4 fluorescent bulbs in each (4ft).
Each 2 bulbs are supported by one magnetic ballast.

The ballast is Rapid Start Magnatek 446-L-SLH-TC-P as below:

Description: Electromagnetic ballast for (2) fluorescent lamps as indicated
below:
.. Line Voltage: 120 vac, + 5%, - 10%, 60Hz . Rapid Start
.. Series Lamp Operation . High Power Factor

The lights got dimmer over time and now only one glows, others do not work.
The ballasts are about 10 years old.

Do the ballast "get weaker" over time? What is the most likely failure
mode? Is there a way to test them with VOM?

Regards,

RichK