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?